Initial commit

28 files changed, 1712 insertions, 0 deletions

diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..ae4d75c
--- /dev/null
+++ b/.envrc
@@ -0,0 +1,2 @@
+git config --local core.hooksPath $PWD/.githooks
+use flake .
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4ba15f1
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,35 @@
+# Dune
+_build/
+.merlin
+*.install
+result
+
+# opam
+_opam/
+
+# npm
+node_modules/
+example/*/package-lock.json
+
+.wormhole.opam
+# esy
+_esy/
+esy.lock
+
+# Release script
+dream-*.gz
+dream-*/
+
+# Bisect_ppx
+_coverage/
+
+# Humans
+scratch/
+
+# Editors
+.vscode/
+*.swp
+.direnv/*
+
+private.pem
+*.opam
diff --git a/.ocamlformat b/.ocamlformat
new file mode 100644
index 0000000..3998b54
--- /dev/null
+++ b/.ocamlformat
@@ -0,0 +1,2 @@
+profile = janestreet
+parse-docstrings = true
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..3c15303
--- /dev/null
+++ b/README.md
@@ -0,0 +1,6 @@
+# Bloop Ann
+
+## Prerequisites
+
+- Nix
+- Direnv
diff --git a/bin/dune b/bin/dune
new file mode 100644
index 0000000..62d69ee
--- /dev/null
+++ b/bin/dune
@@ -0,0 +1,5 @@
+(executable
+ (public_name ann_bloop)
+ (name main)
+ (libraries ann_bloop uri dream)
+ (preprocess (pps lwt_ppx ppx_yojson_conv ppx_inline_test)))
diff --git a/bin/main.ml b/bin/main.ml
new file mode 100644
index 0000000..2ed3595
--- /dev/null
+++ b/bin/main.ml
@@ -0,0 +1,19 @@
+open Ann_bloop
+
+let () =
+  let port =
+    Sys.getenv_opt "PORT" |> Option.map int_of_string
+    |> Option.value ~default:8080
+  in
+  let env = Sys.getenv_opt "ENV" |> Option.value ~default:"PROD" in
+  let disable_auth =
+    Sys.getenv_opt "DISABLE_AUTH" |> Option.value ~default:"false"
+  in
+  let interface = if env = "DEV" then "localhost" else "0.0.0.0" in
+  Dream.run ~port ~interface @@ Dream.logger
+  @@ Dream.router
+       [
+         Dream.get "/actor" (fun _ ->
+             Dream.log "Sending actor";
+             Dream.html "Hello world!")
+       ]
diff --git a/dune-project b/dune-project
new file mode 100644
index 0000000..dc732ee
--- /dev/null
+++ b/dune-project
@@ -0,0 +1,27 @@
+(lang dune 3.11)
+
+(name ann_bloop)
+
+(generate_opam_files true)
+
+(source
+ (github username/reponame))
+
+(authors "Marc Coquand")
+
+(maintainers "Marc Coquand")
+
+(license AGPL-3.0-only)
+
+(documentation https://url/to/documentation)
+
+(package
+ (name ann_bloop)
+ (synopsis "A short synopsis")
+ (description "A longer description")
+ (depends ocaml dune dream ppx_yojson_conv crunch cohttp lwt_ppx cohttp-lwt-unix containers calendar ptime mirage-crypto-rng mirage-crypto-rng-lwt ppx_inline_test ppx_deriving decoders-yojson)    
+ (tags
+  (topics "to describe" your project)))
+
+
+; See the complete stanza docs at https://dune.readthedocs.io/en/stable/dune-files.html#dune-project
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..7560b91
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,189 @@
+{
+  "nodes": {
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1627913399,
+        "narHash": "sha256-hY8g6H2KFL8ownSiFeMOjwPC8P0ueXpCVEbxgda3pko=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "12c64ca55c1014cdc1b16ed5a804aa8576601ff2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1701680307,
+        "narHash": "sha256-kAuep2h5ajznlPMD9rnQyffWG8EM/C73lejGofXvdM8=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "4022d587cbbfd70fe950c1e2083a02621806a725",
+        "type": "github"
+      },
+      "original": {
+        "id": "flake-utils",
+        "type": "indirect"
+      }
+    },
+    "flake-utils_2": {
+      "locked": {
+        "lastModified": 1638122382,
+        "narHash": "sha256-sQzZzAbvKEqN9s0bzWuYmRaA03v40gaJ4+iL1LXjaeI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "74f7e4319258e287b0f9cb95426c9853b282730b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "mirage-opam-overlays": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1661959605,
+        "narHash": "sha256-CPTuhYML3F4J58flfp3ZbMNhkRkVFKmBEYBZY5tnQwA=",
+        "owner": "dune-universe",
+        "repo": "mirage-opam-overlays",
+        "rev": "05f1c1823d891ce4d8adab91f5db3ac51d86dc0b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "dune-universe",
+        "repo": "mirage-opam-overlays",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1703117891,
+        "narHash": "sha256-E7p42UknHFHoBmHz+xuqK6S0gvKrvMWoN28ld1iGbAc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "b7976f22c685f9c6e28be644806f0f1901813203",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "opam-nix": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "flake-utils": "flake-utils_2",
+        "mirage-opam-overlays": "mirage-opam-overlays",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "opam-overlays": "opam-overlays",
+        "opam-repository": [
+          "opam-repository"
+        ],
+        "opam2json": "opam2json"
+      },
+      "locked": {
+        "lastModified": 1702988812,
+        "narHash": "sha256-XdGK59SJsZZU9eeulWxopzdS3PZSbRls7i53KEJZ60A=",
+        "owner": "tweag",
+        "repo": "opam-nix",
+        "rev": "a2c8f7d640f1dcb92f036044f13eb9135f6db474",
+        "type": "github"
+      },
+      "original": {
+        "owner": "tweag",
+        "repo": "opam-nix",
+        "type": "github"
+      }
+    },
+    "opam-overlays": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1654162756,
+        "narHash": "sha256-RV68fUK+O3zTx61iiHIoS0LvIk0E4voMp+0SwRg6G6c=",
+        "owner": "dune-universe",
+        "repo": "opam-overlays",
+        "rev": "c8f6ef0fc5272f254df4a971a47de7848cc1c8a4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "dune-universe",
+        "repo": "opam-overlays",
+        "type": "github"
+      }
+    },
+    "opam-repository": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1703021868,
+        "narHash": "sha256-7E9uT7tc6qcJrr/oTWY3wgtQawM4zymtyn8k0hCwjko=",
+        "owner": "ocaml",
+        "repo": "opam-repository",
+        "rev": "1a01639f743228bcd2b03a3a610c8c2b88bbd944",
+        "type": "github"
+      },
+      "original": {
+        "owner": "ocaml",
+        "repo": "opam-repository",
+        "type": "github"
+      }
+    },
+    "opam2json": {
+      "inputs": {
+        "nixpkgs": [
+          "opam-nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1671540003,
+        "narHash": "sha256-5pXfbUfpVABtKbii6aaI2EdAZTjHJ2QntEf0QD2O5AM=",
+        "owner": "tweag",
+        "repo": "opam2json",
+        "rev": "819d291ea95e271b0e6027679de6abb4d4f7f680",
+        "type": "github"
+      },
+      "original": {
+        "owner": "tweag",
+        "repo": "opam2json",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "opam-nix": "opam-nix",
+        "opam-repository": "opam-repository"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..20b8532
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,66 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs";
+    opam-nix.url = "github:tweag/opam-nix";
+    opam-repository = {
+      url = "github:ocaml/opam-repository";
+      flake = false;
+    };
+    opam-nix.inputs.opam-repository.follows = "opam-repository";
+    opam-nix.inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = { self, nixpkgs, opam-nix, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        system = "x86_64-linux";
+        pkgs = nixpkgs.legacyPackages.${system};
+        inherit (opam-nix.lib.${system})
+          buildOpamProject
+          materializedDefsToScope
+          materializeOpamProject';
+        package = "ann_bloop";
+        devPackagesQuery = {
+          ocaml-lsp-server = "*";
+          ocamlformat = "*";
+          # 1.9.6 fails to build
+          ocamlfind = "1.9.5";
+          utop = "*";
+        };
+        query = {
+          ocaml-base-compiler = "*";
+        };
+        overlay = final: prev: {
+          "${package}" = prev.${package}.overrideAttrs (_: {
+            # override derivation attributes, e.g. add additional dependacies
+            buildInputs = [ 
+              pkgs."gmp"
+              pkgs."libev"
+              pkgs."openssl"
+            ];
+          });
+        };
+        devBuildInputs = [ pkgs.ocamlPackages.ocamlformat ];
+        resolved-scope =
+          let scope = buildOpamProject { } package ./. query;
+          in scope.overrideScope' overlay;
+        materialized-scope =
+          let scope = materializedDefsToScope
+            { sourceMap.${package} = ./.; } ./package-defs.json;
+          in scope.overrideScope' overlay;
+      in rec {
+        packages = {
+          resolved = resolved-scope;
+          materialized = materialized-scope;
+          # to generate:
+          #   cat $(nix eval .#package-defs --raw) > package-defs.json
+          package-defs = materializeOpamProject' { } ./. query;
+        };
+        defaultPackage = packages.materialized.${package};
+        devShells.default = pkgs.mkShell {
+          inputsFrom = [ defaultPackage ];
+          buildInputs = devBuildInputs;
+        };
+      }
+    );
+}
diff --git a/lib/activitypub/activitypub.ml b/lib/activitypub/activitypub.ml
new file mode 100644
index 0000000..511b4a3
--- /dev/null
+++ b/lib/activitypub/activitypub.ml
@@ -0,0 +1,5 @@
+module Common = Common
+module Constants = Constants
+module Types = Types
+module Encode = Encode
+module Decode = Decode
diff --git a/lib/activitypub/common.ml b/lib/activitypub/common.ml
new file mode 100644
index 0000000..59c7099
--- /dev/null
+++ b/lib/activitypub/common.ml
@@ -0,0 +1,47 @@
+module D = Decoders_yojson.Safe.Decode
+
+let timestamp =
+  let open D in
+  let* time = string in
+  match Ptime.of_rfc3339 time |> Ptime.rfc3339_error_to_msg with
+  | Ok (t, _, _) -> succeed t
+  | Error `Msg err -> fail err
+
+let singleton_or_list dec =
+  D.(one_of ["singleton", (dec >|= fun v -> [v]);
+             "list", list dec;
+             "null", null >|= fun () -> []])  
+
+let lossy_list_of dec =
+  let open D in
+  list (one_of ["known", (dec >|= fun v -> `Value v); "unknown", value >|= fun v -> `Raw v])
+
+
+let constant ?msg target =
+  let open D in
+  let* str = string in
+  if String.equal str target
+  then succeed ()
+  else match msg with
+    | None -> fail (Printf.sprintf "expected %s received %s" target str)
+    | Some msg -> fail (Printf.sprintf msg str)
+
+let field_or_default field' decoder default =
+  let open D in
+  let+ field = field_opt field' decoder in
+  Option.value ~default field
+
+let list_ignoring_unknown ty =
+  let open D in
+  list (maybe ty) >|= fun v -> List.filter_map Fun.id v
+
+let items obj =
+  let open D in
+  one_of [
+    ("ordered items",
+     let* items = field "orderedItems" (list obj) in
+     succeed (true, items));
+    "items",
+    let* items = field "items" (list obj) in
+    succeed (false, items)
+  ]
diff --git a/lib/activitypub/constants.ml b/lib/activitypub/constants.ml
new file mode 100644
index 0000000..0488335
--- /dev/null
+++ b/lib/activitypub/constants.ml
@@ -0,0 +1,49 @@
+open Containers
+
+module ContentType = struct
+  let ld_json_activity_streams = "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\""
+
+  let xrd_xml = "application/xrd+xml"
+  let ld_json = "application/ld+json"
+  let activity_json = "application/activity+json"
+  let plain_json = "application/json"
+  let html = "text/html"
+  let any = "*/*"
+
+  let content_types = [
+    ld_json_activity_streams, `JSON;
+    ld_json, `JSON;
+    activity_json, `JSON;
+    plain_json, `JSON;
+    html, `HTML;
+    any, `HTML;
+  ]
+
+  let of_string content_type =
+    List.find_opt
+      (fun (str, _) ->
+         String.prefix ~pre:str content_type) content_types
+    |> Option.map snd
+
+
+end
+
+module Webfinger = struct
+  let json_rd = "application/jrd+json"
+
+  let self_rel = "self"
+  let ostatus_rel = "http://ostatus.org/schema/1.0/subscribe"
+  let profile_page = "http://webfinger.net/rel/profile-page"
+end
+
+module ActivityStreams = struct
+
+  let public = "https://www.w3.org/ns/activitystreams#Public"
+
+  let context : string * Yojson.Safe.t =
+    "@context", `List [
+      `String "https://www.w3.org/ns/activitystreams";
+      `String "https://w3id.org/security/v1"
+    ]
+
+end
diff --git a/lib/activitypub/decode.ml b/lib/activitypub/decode.ml
new file mode 100644
index 0000000..4074e68
--- /dev/null
+++ b/lib/activitypub/decode.ml
@@ -0,0 +1,352 @@
+open Containers
+open Common
+
+let decode_string enc vl = D.decode_string enc vl |> Result.map_err D.string_of_error
+
+let id = D.(one_of ["string", string; "id", field "id" string])
+
+let ordered_collection_page obj =
+  let open D in
+  let* () = field "type" @@ constant ~msg:"Expected OrderedCollectionPage (received %s)" "OrderedCollectionPage"
+  and* id = field "id" string
+  and* next = field_opt "next" id
+  and* prev = field_opt "prev" id
+  and* part_of = field_opt "partOf" string
+  and* total_items = field_opt "totalItems" int
+  and* (is_ordered, items) = items obj in
+  succeed ({id; next; prev; part_of; total_items; is_ordered; items}: _ Types.ordered_collection_page)
+
+let ordered_collection obj =
+  let open D in
+  let* () = field "type" @@ constant ~msg:"Expected OrderedCollection (received %s)" "OrderedCollection"
+  and* id = field_opt "id" string
+  and* total_items = field "totalItems" int
+  and* contents =
+    one_of [
+      "items", map (fun v -> `Items v) (items obj);
+      "first", map (fun v -> `First v) (field "first" (ordered_collection_page obj))
+    ] in
+  succeed ({id; total_items; contents}: _ Types.ordered_collection)
+
+let mention =
+  let open D in
+  let* () = field "type" @@ constant ~msg:"expected Mention (received %s)" "Mention"
+  and* href = field "href" string
+  and* name = field "name" string in
+  succeed ({ty=`Mention; href;name} : Types.tag)
+
+let hashtag =
+  let open D in
+  let* () = field "type" @@ constant ~msg:"expected Hashtag (received %s)" "Hashtag"
+  and* href = field "href" string
+  and* name = field "name" string in
+  succeed ({ty=`Hashtag; href;name}: Types.tag)
+
+let tag =
+  let open D in
+  let* ty = field "type" string in
+  match ty with
+  | "Mention" -> mention
+  | "Hashtag" -> hashtag
+  | _ -> fail (Printf.sprintf "unknown tag %s" ty)
+
+let undo obj =
+  let open D in
+  let* () = field "type" @@ constant ~msg:"expected Undo (received %s)" "Undo"
+  and* id = field "id" string
+  and* actor = field "actor" id
+  and* published = field_opt "published" timestamp
+  and* obj = field "object" obj
+  and* raw = value in
+  succeed ({id;published;actor;obj;raw}: _ Types.undo)
+
+let like =
+  let open D in
+  let* () = field "type" @@ constant ~msg:"expected Like (received %s)" "Like"
+  and* id = field "id" string
+  and* actor = field "actor" id
+  and* published = field_opt "published" timestamp
+  and* obj = field "object" id
+  and* raw = value in
+  succeed ({id; actor; published; obj; raw}: Types.like)
+
+let tombstone =
+  let open D in
+  let* () = field "type" @@ constant ~msg:"expected Tombstone (received %s)" "Tombstone"
+  and* id = field "id" string in
+  succeed id
+
+let delete obj =
+  let open D in
+  let* () = field "type" @@ constant ~msg:"expected Delete (received %s)" "Delete"
+  and* id = field "id" string
+  and* actor = field "actor" id
+  and* published = field_opt "published" timestamp
+  and* obj = field "object" obj
+  and* raw = value in
+  succeed ({id;published;actor;obj;raw}: _ Types.delete)
+
+let block =
+  let open D in
+  let* () = field "type" @@ constant ~msg:"expected Block (received %s)" "Block"
+  and* id = field "id" string
+  and* obj = field "object" string
+  and* published = field_opt "published" timestamp
+  and* actor = field "actor" id
+  and* raw = value in
+  succeed ({id;published;obj;actor;raw}: Types.block)
+
+let accept obj =
+  let open D in
+  let* () = field "type" @@ constant ~msg:"expected Accept (received %s)" "Accept"
+  and* id = field "id" string
+  and* actor = field "actor" id
+  and* published = field_opt "published" timestamp
+  and* obj = field "object" obj
+  and* raw = value in
+  succeed ({id;published;actor;obj;raw}: _ Types.accept)
+
+let public_key =
+  let open D in
+  let* id = field "id" string
+  and* owner = field "owner" string
+  and* pem = field "publicKeyPem" string in
+  succeed ({id;owner;pem}: Types.public_key)
+
+let attachment =
+  let open D in
+  let* media_type = field_opt "mediaType" string
+  and* name = field_opt "name" string
+  and* type_ = field_opt "type" string
+  and* url = field "url" string in
+  succeed ({media_type;name;type_;url}: Types.attachment)
+
+
+let person =
+  let open D in
+  let* () = field "type" @@ constant ~msg:"expected Person (received %s)" "Person"
+  and* id = field "id" string
+  and* name = field_opt "name" string
+  and* url = field_or_default "url" (nullable string) None
+  and* preferred_username = field_opt "preferredUsername" string
+  and* inbox = field "inbox" string
+  and* outbox = field "outbox" string
+  and* summary = field_opt "summary" string
+  and* public_key = field "publicKey" public_key
+  and* manually_approves_followers =
+    field_or_default "manuallyApprovesFollowers" bool false
+  and* discoverable = field_or_default "discoverable" bool false
+  and* followers = field_opt "followers" string
+  and* following = field_opt "following" string
+  and* icon = maybe (at ["icon";"url"] string)
+  and* raw = value in
+  succeed ({
+    id;
+    name;
+    url;
+
+    preferred_username;
+
+    inbox;
+    outbox;
+
+    summary;
+
+    public_key;
+
+    manually_approves_followers;
+
+    discoverable;
+    followers;
+    following;
+    icon;
+    raw;
+  }: Types.person)
+
+let note = 
+  let open D in
+  let* () = field "type" @@ constant ~msg:"expected Note (received %s)" "Note"
+  and* id = field "id" string
+  and* actor = one_of ["actor", field "actor" id; "attributed_to", field "attributedTo" id]
+  and* attachment = field_or_default "attachment" (singleton_or_list attachment) []
+  and* to_ = field "to" (singleton_or_list string)
+  and* in_reply_to = field_or_default "inReplyTo" (nullable string) None
+  and* cc = field_or_default "cc" (singleton_or_list string) []
+  and* content = field "content" string
+  and* source = field_opt "source"
+                  (one_of ["string", string; "multi-encode", field "content" string])
+  and* summary = field_or_default "summary" (nullable string) None
+  and* sensitive = field_or_default "sensitive" (nullable bool) None
+  and* published = field_opt "published" timestamp
+  and* tags = field_or_default "tag" (lossy_list_of tag) []
+  and* raw = value in
+  succeed ({ id; actor; attachment; in_reply_to; to_; cc;
+             sensitive=Option.value ~default:false sensitive;
+             content; source; summary; tags; published; raw }: Types.note)
+
+let follow =
+  let open D in
+  let* () = field "type" @@ constant ~msg:"expected create object (received %s)" "Follow"
+  and* actor = field "actor" id
+  and* cc = field_or_default "cc" (singleton_or_list string) []
+  and* to_ = field_or_default "to" (singleton_or_list string) []
+  and* id = field "id" string
+  and* object_ = field "object" id
+  and* state = field_opt "state" (string >>= function "pending" -> succeed `Pending
+                                                    | "cancelled" -> succeed `Cancelled
+                                                    | _ -> fail "unknown status")
+  and* raw = value in
+  succeed ({actor; cc; to_; id; object_; state; raw}: Types.follow)
+
+let announce obj =
+  let open D in
+  let* () = field "type" @@ constant ~msg:"expected create object (received %s)" "Announce"
+  and* actor = field "actor" id
+  and* id = field "id" string
+  and* published = field_opt "published" timestamp
+  and* to_ = field "to" (singleton_or_list string)
+  and* cc = field_or_default "cc" (singleton_or_list string) []
+  and* obj = field "object" obj
+  and* raw = value in
+  succeed ({id; published; actor; to_; cc; obj; raw}: _ Types.announce)
+
+let create obj =
+  let open D in
+  let* () = field "type" @@ constant ~msg:"expected create object (received %s)" "Create"
+  and* id = field "id" string
+  and* actor = field "actor" id
+  and* direct_message = field_or_default "direct" bool false
+  and* published = field_opt "published" timestamp
+  and* to_ = field_or_default "to" (singleton_or_list string) []
+  and* cc = field_or_default "cc" (singleton_or_list string) []
+  and* obj = field "object" obj
+  and* raw = value in
+
+  succeed ({
+    id; actor; published;
+    to_; cc;
+    direct_message;
+    obj;
+    raw;
+  }: _ Types.create)
+
+let core_obj () =
+  let open D in
+  let* ty = field_opt "type" string in
+  match ty with
+  | Some "Person" -> person >|= fun v -> `Person v
+  | Some "Follow" -> follow >|= fun v -> `Follow v
+  | Some "Note" -> note >|= fun v -> `Note v
+  | Some "Block" -> block >|= fun v -> `Block v
+  | Some "Like" -> like >|= fun v -> `Like v
+  | None -> string >|= fun v -> `Link v
+  | Some ev -> fail ("unsupported event" ^ ev)
+
+let core_obj = core_obj ()
+
+let event (enc: Types.core_obj D.decoder) : Types.obj D.decoder =
+  let open D in
+  let* ty = field "type" string in
+  match ty with
+  | "Create" -> create enc >|= fun v -> `Create v
+  | "Accept" -> accept enc >|= fun v -> `Accept v
+  | "Undo" -> undo enc >|= fun v -> `Undo v
+  | "Delete" -> delete enc >|= fun v -> `Delete v
+  | "Announce" -> announce enc >|= fun v -> `Announce v
+  | _ -> fail "unsupported event"
+
+let obj : Types.obj D.decoder =
+  D.one_of [
+    "core_obj", core_obj;
+    "core_obj event", (event core_obj)
+  ]
+
+module Webfinger = struct
+
+  let ty =
+    let open D in
+    string >>= function
+    | str when String.prefix ~pre:Constants.ContentType.html str ->
+      succeed `Html
+    | str when String.prefix ~pre:Constants.ContentType.plain_json str ->
+      succeed `Json
+    | str when String.prefix ~pre:Constants.ContentType.activity_json str ->
+      succeed `ActivityJson
+    | str when String.prefix ~pre:Constants.ContentType.ld_json_activity_streams str ->
+      succeed `ActivityJsonLd
+    | _ ->
+      fail "unsupported self link type"
+
+  let self =
+    let open D in
+    let* ty = field "type" ty
+    and* href = field "href" string in
+    succeed @@ Types.Webfinger.Self (ty, href)
+
+  let profile_page =
+    let open D in
+    let* ty = field "type" ty
+    and* href = field "href" string in
+    succeed @@ Types.Webfinger.ProfilePage (ty, href)
+
+  let ostatus_subscribe =
+    let open D in
+    let* template = field "template" string in
+    succeed @@ Types.Webfinger.OStatusSubscribe template
+
+  let link =
+    let open D in
+    let* rel = field "rel" string in
+    match rel with
+    | "self" -> self
+    | str when String.equal str Constants.Webfinger.ostatus_rel ->
+      ostatus_subscribe
+    | str when String.equal str Constants.Webfinger.profile_page ->
+      profile_page
+    | _ -> fail "unsupported link relation"
+
+  let query_result =
+    let open D in
+    let* subject = field "subject" string
+    and* aliases = field "aliases" (list string)
+    and* links = field "links" (list_ignoring_unknown link) in
+
+    succeed Types.Webfinger.{subject;aliases;links}
+
+end
+
+module Nodeinfo = struct
+
+  let software =
+    let open D in
+    let* name = field "name" string
+    and* version = field "version" string in
+    succeed @@ Types.Nodeinfo.{name;version}
+
+  let usage_users =
+    let open D in
+    let* total = field_or_default "total" int 0
+    and* active_month = field_or_default "activeMonth" int 0
+    and* active_half_year = field_or_default "activeHalfyear" int 0 in
+    succeed @@ Types.Nodeinfo.{total; active_month; active_half_year}
+
+  let usage =
+    let open D in
+    let* users = field "users" usage_users 
+    and* local_posts = field_or_default "localPosts" int 0 in
+    succeed @@ Types.Nodeinfo.{users; local_posts}
+
+  let t =
+    let open D in
+    let* software = field "software" software
+    and* protocols = field_or_default "protocols" (list string) []
+    and* inbound_services = field_or_default "services" (field_or_default "inbound" (list string) []) []
+    and* outbound_services = field_or_default "services" (field_or_default "outbound" (list string) []) []
+    and* usage = field "usage" usage
+    and* open_registrations = field_or_default "openRegistrations" bool false 
+    and* metadata = field_opt "metadata" value
+    and* raw = value in
+    succeed @@ Types.Nodeinfo.{software;protocols;inbound_services;outbound_services;usage;open_registrations;metadata;raw}
+
+
+end
diff --git a/lib/activitypub/dune b/lib/activitypub/dune
new file mode 100644
index 0000000..9222a82
--- /dev/null
+++ b/lib/activitypub/dune
@@ -0,0 +1,3 @@
+(library (name activitypub)
+ (preprocess (pps ppx_deriving.std))
+ (libraries containers uri yojson decoders decoders-yojson ptime))
diff --git a/lib/activitypub/encode.ml b/lib/activitypub/encode.ml
new file mode 100644
index 0000000..2b64e76
--- /dev/null
+++ b/lib/activitypub/encode.ml
@@ -0,0 +1,303 @@
+module E = Decoders_yojson.Safe.Encode
+
+
+let (<:) = function
+  | (_, None) -> fun _ -> []
+  | (field, Some vl) -> fun ty -> [field, ty vl]
+let (@) field vl = (field, Some vl)
+let (@?) field vl = (field, vl)
+
+let ptime time = E.string (Ptime.to_rfc3339 ~tz_offset_s:0 time)
+let obj ls = E.obj @@ List.flatten ls
+let ap_obj ty ls =
+  E.obj (Constants.ActivityStreams.context :: ("type", E.string ty) :: List.flatten ls)
+
+let or_raw conv = function
+  | `Raw v -> v
+  | `Value v -> conv v
+
+(** * Collections  *)
+let ordered_collection_page enc
+      ({ id; prev; next; is_ordered; items; part_of; total_items }:
+         _ Types.ordered_collection_page) =
+  ap_obj "OrderedCollectionPage" [
+    "id" @ id <: E.string;
+    "next" @? next <: E.string;
+    "prev" @? prev <: E.string;
+    "partOf" @? part_of <: E.string;
+    "totalItems" @? total_items <: E.int;
+    (match is_ordered with
+     | true -> "orderedItems"
+     | false -> "items")  @ items <: E.list enc
+  ]
+
+let ordered_collection enc
+      ({ id; total_items; contents }: _ Types.ordered_collection) =
+  ap_obj "OrderedCollection" [
+    "id" @? id <: E.string;
+    "totalItems" @ total_items <: E.int;
+    match contents with
+    | `First page -> "first" @ page <: ordered_collection_page enc
+    | `Items (true, items) -> "orderedItems" @ items <: E.list enc
+    | `Items (false, items) -> "items" @ items <: E.list enc
+  ]
+
+(** * Events *)
+
+let create enc ({ id; actor; published; to_; cc; direct_message; obj; raw=_ }:
+                  _ Types.create) =
+  ap_obj "Create" [
+    "id" @ id <: E.string;
+    "actor" @ actor <: E.string;
+    "published" @? published <: ptime;
+    "to" @ to_ <: E.(list string);
+    "cc" @ cc <: E.(list string);
+    "directMessage"  @ direct_message <: E.bool;
+    "object" @ obj <: enc;
+  ]
+
+let announce enc ({ id; actor; published; to_; cc; obj; raw=_ } : _ Types.announce) =
+  ap_obj "Announce" [
+    "id" @ id <: E.string;
+    "actor" @ actor <: E.string;
+    "published" @? published <: ptime;
+    "to" @ to_ <: E.(list string);
+    "cc" @ cc <: E.(list string);
+    "object" @ obj <: enc;
+  ]
+
+let accept enc ({ id; actor; published; obj; raw=_ } : _ Types.accept) =
+  ap_obj "Accept" [
+    "id" @ id <: E.string;
+    "actor" @ actor <: E.string;
+    "published" @? published <: ptime;
+    "object" @ obj <: enc;
+  ]
+
+let undo enc ({ id; actor; published; obj; raw=_ } : _ Types.undo) =
+  ap_obj "Undo" [
+    "id" @ id <: E.string;
+    "actor" @ actor <: E.string;
+    "published" @? published <: ptime;
+    "object" @ obj <: enc;
+  ]
+
+let delete enc ({ id; actor; published; obj; raw=_ } : _ Types.delete) =
+  ap_obj "Delete" [
+    "id" @ id <: E.string;
+    "actor" @ actor <: E.string;
+    "published" @? published <: ptime;
+    "object" @ obj <: enc;
+  ]
+
+(** * Objects *)
+
+let public_key (key: Types.public_key) =
+  obj [
+    "id" @ key.id <: E.string;
+    "owner" @ key.owner <: E.string;
+    "publicKeyPem" @ key.pem <: E.string;
+  ]
+
+let icon (url: string) =
+  obj [
+    "type" @ "Image" <: E.string;
+    "url" @ url <: E.string;
+  ]
+
+let person ({ id; name; url; inbox; outbox;
+              preferred_username; summary;
+              manually_approves_followers;
+              discoverable; followers; following;
+              public_key=key; icon=i; raw=_ }: Types.person) =
+  ap_obj "Person" [
+
+    "id" @ id <: E.string;
+
+    "name" @? name <: E.string;
+    "url" @? url <: E.string;
+
+    "preferredUsername" @? preferred_username <: E.string;
+
+    "inbox" @ inbox <: E.string;
+    "outbox" @ outbox <: E.string;
+
+    "summary" @? summary <: E.string;
+
+    "publicKey" @ key <: public_key;
+
+    "manuallyApprovesFollowers" @ manually_approves_followers <: E.bool;
+
+    "discoverable" @ discoverable <: E.bool;
+
+    "followers" @? followers <: E.string;
+    "following" @? following <: E.string;
+
+    "icon" @? i <: icon;
+  ]
+
+let state = function
+    `Pending -> E.string "pending"
+  | `Cancelled -> E.string "cancelled"
+
+
+let follow ({ id; actor; cc; object_; to_; state=st; raw=_ }: Types.follow) =
+  ap_obj "Follow" [
+    "id" @ id <: E.string;
+    "actor" @ actor <: E.string;
+    "to" @ to_ <: E.list E.string;
+    "cc" @ cc <: E.list E.string;
+    "object" @ object_ <: E.string;
+    "state" @? st <: state;
+  ]
+
+let tag ({ ty; href; name }: Types.tag) =
+  ap_obj (match ty with `Mention -> "Mention" | `Hashtag -> "Hashtag") [
+    "href" @ href <: E.string;
+    "name" @ name <: E.string;
+  ]
+
+let attachment ({media_type; name; url; type_}: Types.attachment) =
+  obj [
+    "type" @? type_ <: E.string;
+    "mediaType" @? media_type <: E.string;
+    "name" @? name <: E.string;
+    "url" @ url <: E.string;
+  ]
+
+let note ({ id; actor; to_; in_reply_to; cc; content; sensitive; source; summary;
+            attachment=att;
+            published; tags; raw=_ }: Types.note) =
+  let att = match att with [] -> None | _ -> Some att in
+  ap_obj "Note" [
+    "id" @ id <: E.string;
+    "actor" @ actor <: E.string;
+    "attachment" @? att <: E.list attachment;
+    "to" @ to_ <: E.list E.string;
+    "inReplyTo" @? in_reply_to <: E.string;
+    "cc" @ cc <: E.list E.string;
+    "content" @ content <: E.string;
+    "sensitive" @ sensitive <: E.bool;
+    "source" @? source <: E.string;
+    "summary" @? summary <: E.string;
+    "published" @? published <: ptime;
+    "tags" @ tags <: E.list (or_raw tag);
+  ]
+
+let block ({ id; obj; published; actor; raw=_ }: Types.block) =
+  ap_obj "Block" [
+    "id" @ id <: E.string;
+    "object" @ obj <: E.string;
+    "actor" @ actor <: E.string;
+    "published" @? published <: ptime;
+  ]
+
+let like ({ id; actor; published; obj; raw=_ }: Types.like) =
+  ap_obj "Like" [
+    "id" @ id <: E.string;
+    "actor" @ actor <: E.string;
+    "object" @ obj <: E.string;
+    "published" @? published <: ptime;
+  ]
+
+
+let core_obj : Types.core_obj E.encoder = function
+  | `Follow f -> follow f
+  | `Block b -> block b
+  | `Note n -> note n
+  | `Person p -> person p
+  | `Like l -> like l
+  | `Link r -> E.string r
+
+let event enc : _ Types.event E.encoder = function
+  | `Announce a -> announce enc a
+  | `Undo u -> undo enc u
+  | `Delete d -> delete enc d
+  | `Create c -> create enc c
+  | `Accept a -> accept enc a
+
+let object_ : Types.obj E.encoder = function
+  | #Types.core_obj as c -> core_obj c
+  | #Types.core_event as e -> event core_obj e
+
+module Webfinger = struct
+
+  let ty = function
+    | `ActivityJson -> E.string Constants.ContentType.activity_json
+    | `Html -> E.string Constants.ContentType.html
+    | `ActivityJsonLd -> E.string Constants.ContentType.ld_json_activity_streams
+    | `Json -> E.string Constants.ContentType.plain_json
+
+  let link = function
+    | Types.Webfinger.Self (t, href) -> obj [
+      "href" @ href <: E.string;
+      "rel" @ Constants.Webfinger.self_rel <: E.string;
+      "type" @ t <: ty;
+    ]
+    | ProfilePage (t, href) ->
+      obj [
+        "href" @ href <: E.string;
+        "rel" @ Constants.Webfinger.profile_page <: E.string;
+        "type" @ t <: ty;
+      ]
+    | OStatusSubscribe template -> obj [
+      "rel" @ Constants.Webfinger.ostatus_rel <: E.string;
+      "template" @ template <: E.string;
+    ]
+
+  let query_result ({subject;aliases;links}: Types.Webfinger.query_result) =
+    obj [
+      "subject" @ subject <: E.string;
+      "aliases" @ aliases <: E.(list string);
+      "links" @ links <: E.list link;
+    ]
+
+end
+
+module Nodeinfo = struct
+
+  let software (s: Types.Nodeinfo.software) =
+    obj [
+      "name" @ s.name <: E.string;
+      "version" @ s.version <: E.string;
+    ]
+
+  let usage_users ({ total; active_month; active_half_year }: Types.Nodeinfo.usage_users) =
+    obj [
+      "total" @ total <: E.int;
+      "activeMonth" @ active_month <: E.int;
+      "activeHalfyear" @ active_half_year <: E.int;
+    ]
+
+  let usage ({ local_posts; users } : Types.Nodeinfo.usage) =
+    obj [
+      "users" @ users <: usage_users;
+      "localPosts" @ local_posts <: E.int
+    ]
+
+  let t ({ software=software'; protocols; inbound_services; outbound_services; usage=usage';
+           open_registrations; metadata; raw=_ } : Types.Nodeinfo.t) =
+    obj [
+      "version" @ "2.0" <: E.string;
+      "software" @ software' <: software;
+      "protocols" @ protocols <: E.list E.string;
+      "services" @ obj [
+        "inbound" @ inbound_services <: E.list E.string;
+        "outbound" @ outbound_services <: E.list E.string;
+      ] <: Fun.id;
+      "usage" @ usage' <: usage;
+      "openRegistrations" @ open_registrations <: E.bool;
+      "metadata" @? metadata <: Fun.id;
+    ]
+
+end
+
+
+(* module Build (S: sig
+ *     type user
+ * 
+ *     val owner: user -> Uri.t
+ * 
+ *   end) = struct
+ * 
+ * end *)
diff --git a/lib/activitypub/readme.md b/lib/activitypub/readme.md
new file mode 100644
index 0000000..7282026
--- /dev/null
+++ b/lib/activitypub/readme.md
@@ -0,0 +1,5 @@
+# Activitypub Encoding
+
+This module defines functions to parse to and from activitypub JSONs from other servers.
+
+Taken from [Ocamlot](https://github.com/gopiandcode/ocamlot).
diff --git a/lib/activitypub/types.ml b/lib/activitypub/types.ml
new file mode 100644
index 0000000..e4a56e9
--- /dev/null
+++ b/lib/activitypub/types.ml
@@ -0,0 +1,245 @@
+type yojson = Yojson.Safe.t
+let pp_yojson fmt vl = Yojson.Safe.pretty_print fmt vl
+let equal_yojson l r = Yojson.Safe.equal l r
+
+(** * Collections *)
+type 'a ordered_collection_page = {
+  id: string;
+  prev: string option;
+  next: string option;
+  is_ordered: bool;
+  items: 'a list;
+  part_of: string option;
+  total_items: int option;
+} [@@deriving show, eq]
+
+
+type 'a ordered_collection = {
+  id: string option;
+  total_items: int;
+  contents: [
+    | `Items of (bool * 'a list)
+    | `First of 'a ordered_collection_page
+  ]
+} [@@deriving show, eq]
+
+(** * Events *)
+type 'a create = {
+  id: string;
+  actor: string;
+  published: Ptime.t option;
+  to_: string list;
+  cc: string list;
+  direct_message: bool;
+  obj: 'a;
+  raw: yojson;
+} [@@deriving show, eq]
+
+
+type 'a announce = {
+  id: string;
+  actor: string;
+  published: Ptime.t option;
+  to_: string list;
+  cc: string list;
+  obj: 'a;
+  raw: yojson;
+} [@@deriving show, eq]
+
+
+type 'a accept = {
+  id: string;
+  actor: string;
+  published: Ptime.t option;
+  obj: 'a;
+  raw: yojson;
+} [@@deriving show, eq]
+
+type 'a undo = {
+  id: string;
+  actor: string;
+  published: Ptime.t option;
+  obj: 'a;
+  raw: yojson;
+} [@@deriving show, eq]
+
+type 'a delete = {
+  id: string;
+  actor: string;
+  published: Ptime.t option;
+  obj: 'a;
+  raw: yojson;
+}
+[@@deriving show, eq]
+
+type 'a event = [
+    `Create of 'a create
+  | `Announce of 'a announce
+  | `Accept of 'a accept
+  | `Undo of 'a undo
+  | `Delete of 'a delete
+] [@@deriving show, eq]
+
+
+(** * Objects *)
+type public_key = {
+  id: string;
+  owner: string;
+  pem: string;
+} [@@deriving show, eq]
+
+type person = {
+  id: string;
+  name: string option;
+  url: string option;
+
+  preferred_username: string option;
+
+  inbox: string;
+  outbox: string;
+
+  summary: string option;
+
+  public_key: public_key;
+
+  manually_approves_followers: bool;
+
+  discoverable: bool;
+  followers: string option;
+  following: string option;
+  icon: string option;
+  raw: yojson;
+}  [@@deriving show, eq]
+
+type follow = {
+  id: string;
+  actor: string;
+  cc: string list;
+  to_: string list;
+  object_: string;
+  state: [`Pending | `Cancelled ] option;
+  raw: yojson;
+} [@@deriving show, eq]
+
+type tag = {
+  ty: [`Mention | `Hashtag ];
+  href: string;
+  name: string;
+} [@@deriving show, eq]
+
+type attachment = {
+  media_type: string option;
+  name: string option;
+  type_: string option;
+  url: string;
+} [@@deriving show, eq]
+
+type note = {
+  id: string;
+  actor: string;
+  attachment: attachment list;
+  to_: string list;
+  in_reply_to: string option;
+  cc: string list;
+  content: string;
+  sensitive: bool;
+  source: string option;
+  summary: string option;
+  published: Ptime.t option;
+  tags: [ `Raw of yojson | `Value of tag ] list;
+  raw: yojson;
+} [@@deriving show, eq]
+
+type block = {
+  id: string;
+  obj: string;
+  published: Ptime.t option;
+  actor: string;
+  raw: yojson;
+} [@@deriving show, eq]
+
+type like = {
+  id: string;
+  actor: string;
+  published: Ptime.t option;
+  obj: string;
+  raw: yojson;
+}
+[@@deriving show, eq]
+
+
+type core_obj = [
+    `Person of person
+  | `Follow of follow
+  | `Note of note
+  | `Block of block
+  | `Like of like
+  | `Link of string
+] [@@deriving show, eq]
+
+type core_event = core_obj event
+[@@deriving show, eq]
+
+type obj = [ core_obj | core_event ]
+[@@deriving show, eq]
+
+module Webfinger = struct
+
+  type ty = [ `Html | `Json | `ActivityJson | `ActivityJsonLd ]
+  [@@deriving show, eq]
+
+  type link =
+    | Self of ty * string
+    | ProfilePage of ty * string
+    | OStatusSubscribe of string
+  [@@deriving show, eq]
+
+  type query_result = {
+    subject: string;
+    aliases: string list;
+    links: link list;
+  }
+  [@@deriving show, eq]
+
+  let self_link query =
+    query.links
+    |> List.find_map (function
+        | Self ((`ActivityJson | `ActivityJsonLd | `Json), url) -> Some (Uri.of_string url)
+        | _ -> None)
+
+end
+
+module Nodeinfo = struct
+
+  type software = {
+    name: string;
+    version: string;
+  }
+  [@@deriving show, eq]
+
+  type usage_users = {
+    total: int;
+    active_month: int;
+    active_half_year: int;
+  }
+  [@@deriving show, eq]
+
+  type usage = {
+    local_posts: int;
+    users: usage_users;
+  }
+  [@@deriving show, eq]
+
+  type t = {
+    software: software;
+    protocols: string list;
+    inbound_services: string list;
+    outbound_services: string list;
+    usage: usage;
+    open_registrations: bool;
+    metadata: yojson option;
+    raw: yojson;
+  }
+  [@@deriving show, eq]
+
+end
diff --git a/lib/dune b/lib/dune
new file mode 100644
index 0000000..f04ae9a
--- /dev/null
+++ b/lib/dune
@@ -0,0 +1,18 @@
+(library
+ (name ann_bloop)
+ (libraries uri 
+        cohttp-lwt-unix
+        containers 
+        base64
+        mirage-crypto 
+        x509
+        lwt 
+        cohttp 
+        dream
+        calendar
+        ptime 
+        decoders-yojson
+ )
+ (preprocess (pps lwt_ppx ppx_yojson_conv ppx_inline_test ))
+ (inline_tests)
+ )
diff --git a/lib/http_date.ml b/lib/http_date.ml
new file mode 100644
index 0000000..38bda02
--- /dev/null
+++ b/lib/http_date.ml
@@ -0,0 +1,37 @@
+(* Taken from https://github.com/gopiandcode/ocamlot *)
+let parse_date = Parser.parse_date
+let parse_date_exn = Parser.parse_date_exn
+
+let to_utc_string t =
+  let www =
+    Ptime.weekday t |> function
+    | `Sat -> "Sat"
+    | `Fri -> "Fri"
+    | `Mon -> "Mon"
+    | `Wed -> "Wed"
+    | `Sun -> "Sun"
+    | `Tue -> "Tue"
+    | `Thu -> "Thu"
+  in
+  let (yyyy, mmm, dd), ((hh, mm, ss), _) = Ptime.to_date_time t in
+  let mmm =
+    match mmm with
+    | 1 -> "Jan"
+    | 2 -> "Feb"
+    | 3 -> "Mar"
+    | 4 -> "Apr"
+    | 5 -> "May"
+    | 6 -> "Jun"
+    | 7 -> "Jul"
+    | 8 -> "Aug"
+    | 9 -> "Sep"
+    | 10 -> "Oct"
+    | 11 -> "Nov"
+    | 12 -> "Dec"
+    | _ -> assert false
+  in
+  Printf.sprintf "%s, %02d %s %04d %02d:%02d:%02d GMT" www dd mmm yyyy hh mm ss
+
+let%test "rev" =
+  List.equal Int.equal (List.rev [ 3; 2; 1 ]) [ 3; 2; 1 ]
+
diff --git a/lib/parser.ml b/lib/parser.ml
new file mode 100644
index 0000000..2e9d759
--- /dev/null
+++ b/lib/parser.ml
@@ -0,0 +1,75 @@
+(*----------------------------------------------------------------------------
+    Copyright (c) 2015 Inhabited Type LLC.
+    All rights reserved.
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+    3. Neither the name of the author nor the names of his contributors
+       may be used to endorse or promote products derived from this software
+       without specific prior written permission.
+    THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND ANY EXPRESS
+    OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+    DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
+    ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+    OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+    STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+    POSSIBILITY OF SUCH DAMAGE.
+  ----------------------------------------------------------------------------*)
+
+let parse_date_exn s =
+  try
+    Scanf.sscanf s "%3s, %d %s %4d %d:%d:%d %s"
+      (fun _wday mday mon year hour min sec tz ->
+        let months =
+          [
+            ("Jan", 1);
+            ("Feb", 2);
+            ("Mar", 3);
+            ("Apr", 4);
+            ("May", 5);
+            ("Jun", 6);
+            ("Jul", 7);
+            ("Aug", 8);
+            ("Sep", 9);
+            ("Oct", 10);
+            ("Nov", 11);
+            ("Dec", 12);
+          ]
+        in
+        let parse_tz = function
+          | "" | "Z" | "GMT" | "UTC" | "UT" -> 0
+          | "PST" -> -480
+          | "MST" | "PDT" -> -420
+          | "CST" | "MDT" -> -360
+          | "EST" | "CDT" -> -300
+          | "EDT" -> -240
+          | s ->
+              Scanf.sscanf s "%c%02d%_[:]%02d" (fun sign hour min ->
+                  min + (hour * if sign = '-' then -60 else 60))
+        in
+        let mon = List.assoc mon months in
+        let year =
+          if year < 50 then year + 2000
+          else if year < 1000 then year + 1900
+          else year
+        in
+        let date = (year, mon, mday) in
+        let time = ((hour, min, sec), parse_tz tz * 60) in
+        let ptime = Ptime.of_date_time (date, time) in
+        match ptime with
+        | None -> raise (Invalid_argument "Invalid date string")
+        | Some date -> date)
+  with
+  | Scanf.Scan_failure e -> raise (Invalid_argument e)
+  | Not_found -> raise (Invalid_argument "Invalid date string")
+
+let parse_date s = try Some (parse_date_exn s) with Invalid_argument _ -> None
diff --git a/lib/sig.ml b/lib/sig.ml
new file mode 100644
index 0000000..b4f49d7
--- /dev/null
+++ b/lib/sig.ml
@@ -0,0 +1,167 @@
+(* Taken from https://gopiandcode.uk/logs/log-writing-activitypub.html
+   License is AGPL-v3
+*)
+open Containers
+module StringMap = Map.Make (String)
+
+let drop_quotes str = String.sub str 1 (String.length str - 2)
+
+let body_digest body =
+  Mirage_crypto.Hash.SHA256.digest (Cstruct.of_string body) |> Cstruct.to_string
+  |> fun hash -> "SHA-256=" ^ Base64.encode_string hash
+
+let req_headers headers = Cohttp.Header.to_list headers |> StringMap.of_list
+
+let split_equals str =
+  match String.index_opt str '=' with
+  | Some ind ->
+      let key = String.sub str 0 ind in
+      let data = String.sub str (ind + 1) (String.length str - ind - 1) in
+      Some (key, data)
+  | _ -> None
+
+(* constructs a signed string *)
+let build_signed_string ~signed_headers ~meth ~path ~headers ~body_digest =
+  (* (request-target) user-agent host date digest content-type *)
+  String.split_on_char ' ' signed_headers
+  |> List.map (function
+       | "(request-target)" ->
+           "(request-target): " ^ String.lowercase_ascii meth ^ " " ^ path
+       | "digest" -> "digest: " ^ body_digest
+       | header ->
+           header ^ ": "
+           ^ (StringMap.find_opt header headers |> Option.value ~default:""))
+  |> String.concat "\n"
+
+let parse_signature signature =
+  String.split_on_char ',' signature
+  |> List.filter_map split_equals
+  |> List.map (Pair.map_snd drop_quotes)
+  |> StringMap.of_list
+
+let verify ~signed_string ~signature pubkey =
+  let result =
+    X509.Public_key.verify `SHA256 ~scheme:`RSA_PKCS1
+      ~signature:(Cstruct.of_string signature)
+      pubkey
+      (`Message (Cstruct.of_string signed_string))
+  in
+  match result with
+  | Ok () -> true
+  | Error (`Msg e) ->
+      Dream.log
+        "error while verifying: %s\n\nsigned_string is:%s\n\nsignature is:%s\n"
+        e signed_string signature;
+      false
+
+let encrypt (privkey : X509.Private_key.t) str =
+  Base64.encode
+    (X509.Private_key.sign `SHA256 ~scheme:`RSA_PKCS1 privkey
+       (`Message (Cstruct.of_string str))
+    |> Result.get_exn |> Cstruct.to_string)
+
+let time_now () =
+  CalendarLib.Calendar.now ()
+  |> CalendarLib.Calendar.to_unixfloat |> Ptime.of_float_s
+  |> Option.get_exn_or "invalid date"
+
+let verify_request taken_public_key (req : Dream.request) =
+  let ( let+ ) x f =
+    match x with None -> Lwt.return (Ok false) | Some v -> f v
+  in
+  let ( let@ ) x f = Lwt.bind x f in
+  let meth =
+    Dream.method_ req |> Dream.method_to_string |> String.lowercase_ascii
+  in
+  let path = Dream.target req in
+  let headers =
+    Dream.all_headers req
+    |> List.map (Pair.map_fst String.lowercase_ascii)
+    |> StringMap.of_list
+  in
+  let+ signature = Dream.header req "Signature" in
+  let signed_headers = parse_signature signature in
+  (* 1. build signed string *)
+  let@ body = Dream.body req in
+  let body_digest = body_digest body in
+  let+ public_key = taken_public_key in
+  (* signed headers *)
+  let+ headers_in_signed_string = StringMap.find_opt "headers" signed_headers in
+  (* signed string *)
+  let signed_string =
+    build_signed_string ~signed_headers:headers_in_signed_string ~meth ~path
+      ~headers ~body_digest
+  in
+  (* 2. retrieve signature *)
+  let+ signature = StringMap.find_opt "signature" signed_headers in
+  let+ signature = Base64.decode signature |> Result.to_opt in
+  (* verify signature against signed string with public key *)
+  Lwt_result.return @@ verify ~signed_string ~signature public_key
+
+let build_signed_headers ~priv_key ~key_id ~headers ?body_str ~current_time
+    ~method_ ~uri () =
+  let signed_headers =
+    match body_str with
+    | Some _ -> "(request-target) content-length host date digest"
+    | None -> "(request-target) host date"
+  in
+
+  let body_str_len = Option.map Fun.(Int.to_string % String.length) body_str in
+  let body_digest = Option.map body_digest body_str in
+
+  let date = Http_date.to_utc_string current_time in
+  let host = uri |> Uri.host |> Option.get_exn_or "no host for request" in
+
+  let signature_string =
+    let opt name vl =
+      match vl with None -> Fun.id | Some vl -> StringMap.add name vl
+    in
+    let to_be_signed =
+      build_signed_string ~signed_headers
+        ~meth:(method_ |> String.lowercase_ascii)
+        ~path:(Uri.path uri)
+        ~headers:
+          (opt "content-length" body_str_len
+          @@ StringMap.add "date" date @@ StringMap.add "host" host @@ headers)
+        ~body_digest:(Option.value body_digest ~default:"")
+    in
+
+    let signed_string = encrypt priv_key to_be_signed |> Result.get_exn in
+    Printf.sprintf
+      {|keyId="%s",algorithm="rsa-sha256",headers="%s",signature="%s"|} key_id
+      signed_headers signed_string
+  in
+  List.fold_left
+    (fun map (k, v) ->
+      match v with None -> map | Some v -> StringMap.add k v map)
+    headers
+    [
+      ("Digest", body_digest);
+      ("Date", Some date);
+      ("Host", Some host);
+      ("Signature", Some signature_string);
+      ("Content-Length", body_str_len);
+    ]
+  |> StringMap.to_list
+
+let sign_headers ~priv_key ~key_id ?(body : Cohttp_lwt.Body.t option)
+    ~(headers : Cohttp.Header.t) ~uri ~method_ () =
+  let ( let* ) x f = Lwt.bind x f in
+
+  let* body_str =
+    match body with
+    | None -> Lwt.return None
+    | Some body -> Lwt.map Option.some (Cohttp_lwt.Body.to_string body)
+  in
+  let current_time = time_now () in
+
+  let headers =
+    List.fold_left
+      (fun header (key, vl) -> Cohttp.Header.add header key vl)
+      headers
+      (build_signed_headers ~priv_key ~key_id ~headers:(req_headers headers)
+         ?body_str ~current_time
+         ~method_:(Cohttp.Code.string_of_method method_)
+         ~uri ())
+  in
+  Lwt.return headers
diff --git a/lib/user.ml b/lib/user.ml
new file mode 100644
index 0000000..ba802c0
--- /dev/null
+++ b/lib/user.ml
@@ -0,0 +1,31 @@
+open Ppx_yojson_conv_lib.Yojson_conv.Primitives
+open Cohttp
+open Cohttp_lwt_unix
+open Lwt
+
+type public_key = {
+  id : string;
+  owner : string;
+  public_key_pem : string; [@key "publicKeyPem"]
+}
+[@@deriving yojson] [@@yojson.allow_extra_fields]
+
+type t = { name : string; public_key : public_key [@key "publicKey"] }
+[@@deriving yojson] [@@yojson.allow_extra_fields]
+
+let activity_header =
+  Some (Header.of_list [ ("Accept", "application/activity+json") ])
+
+let get_user actor_url =
+  let%lwt _, body =
+    Client.get ?headers:activity_header (Uri.of_string actor_url)
+  in
+  body |> Cohttp_lwt.Body.to_string >|= fun body ->
+  let body = Yojson.Safe.from_string body |> t_of_yojson in
+  body
+
+let get_public_pem user =
+  user.public_key.public_key_pem |> Cstruct.of_string
+  |> X509.Public_key.decode_pem
+
+let name user = user.name
diff --git a/package-defs.json b/package-defs.json
new file mode 100644
index 0000000..026f3db
--- /dev/null
+++ b/package-defs.json
@@ -0,0 +1 @@
+{"__opam_nix_env":{},"__opam_nix_regen":null,"angstrom":{"authors":["Spiros Eliopoulos <spiros@inhabitedtype.com>"],"bug-reports":"https://github.com/inhabitedtype/angstrom/issues","build":[{"conditions":[{"id":"dev"}],"val":["dune","subst"]},["dune","build","-p",{"id":"name"},"-j",{"id":"jobs"}],{"conditions":[{"id":"with-test"}],"val":["dune","runtest","-p",{"id":"name"},"-j",{"id":"jobs"}]}],"depends":[{"conditions":[{"arg":"4.04.0","prefix_relop":"geq"}],"val":"ocaml"},{"conditions":[{"arg":"1.8","prefix_relop":"geq"}],"val":"dune"},{"conditions":[{"lhs":{"id":"with-test"},"logop":"and","rhs":{"arg":"0.8.1","prefix_relop":"geq"}}],"val":"alcotest"},"bigstringaf",{"conditions":[{"lhs":{"id":"with-test"},"logop":"and","rhs":{"arg":"v0.14.0","prefix_relop":"geq"}}],"val":"ppx_let"},{"conditions":[{"id":"build"}],"val":"ocaml-syntax-shims"}],"description":"\nAngstrom is a parser-combinator library that makes it easy to write efficient,\nexpressive, and reusable parsers suitable for high-performance applications. It\nexposes monadic and applicative interfaces for composition, and supports\nincremental input through buffered and unbuffered interfaces. Both interfaces\ngive the user total control over the blocking behavior of their application,\nwith the unbuffered interface enabling zero-copy IO. Parsers are backtracking by\ndefault and support unbounded lookahead.","dev-repo":"git+https://github.com/inhabitedtype/angstrom.git","files-contents":{},"homepage":"https://github.com/inhabitedtype/angstrom","isLocal":false,"license":"BSD-3-clause","maintainer":"Spiros Eliopoulos <spiros@inhabitedtype.com>","name":"angstrom","opam-version":"2.0","synopsis":"Parser combinators built for speed and memory-efficiency","url":{"section":{"checksum":"md5=58ebc718a920c31ec3eb38f4aa1bea51","src":"https://github.com/inhabitedtype/angstrom/archive/0.16.0.tar.gz"}},"version":"0.16.0"},"ann_bloop":{"authors":["Marc Coquand"],"bug-reports":"https://github.com/username/reponame/issues","build":[{"conditions":[{"id":"dev"}],"val":["dune","subst"]},["dune","build","-p",{"id":"name"},"-j",{"id":"jobs"},"@install",{"conditions":[{"id":"with-test"}],"val":"@runtest"},{"conditions":[{"id":"with-doc"}],"val":"@doc"}]],"depends":["ocaml",{"conditions":[{"arg":"3.11","prefix_relop":"geq"}],"val":"dune"},"dream","ppx_yojson_conv","crunch","cohttp","lwt_ppx","cohttp-lwt-unix","containers","calendar","ptime","mirage-crypto-rng","mirage-crypto-rng-lwt","ppx_inline_test","ppx_deriving","decoders-yojson",{"conditions":[{"id":"with-doc"}],"val":"odoc"}],"description":"A longer description","dev-repo":"git+https://github.com/username/reponame.git","doc":"https://url/to/documentation","files-contents":{},"homepage":"https://github.com/username/reponame","isLocal":true,"license":"AGPL-3.0-only","maintainer":["Marc Coquand"],"name":"ann_bloop","opam-version":"2.0","synopsis":"A short synopsis","tags":["topics","to describe","your","project"],"version":"dev"},"asn1-combinators":{"authors":"David Kaloper Meršinjak","bug-reports":"https://github.com/mirleft/ocaml-asn1-combinators/issues","build":[{"conditions":[{"id":"dev"}],"val":["dune","subst"]},["dune","build","-p",{"id":"name"},"-j",{"id":"jobs"}],{"conditions":[{"id":"with-test"}],"val":["dune","runtest","-p",{"id":"name"},"-j",{"id":"jobs"}]}],"depends":[{"conditions":[{"arg":"4.08.0","prefix_relop":"geq"}],"val":"ocaml"},{"conditions":[{"arg":"1.2.0","prefix_relop":"geq"}],"val":"dune"},{"conditions":[{"arg":"6.0.0","prefix_relop":"geq"}],"val":"cstruct"},"zarith","ptime",{"conditions":[{"id":"with-test"}],"val":"alcotest"}],"description":"\nasn1-combinators is a library for expressing ASN.1 in OCaml. Skip the notation\npart of ASN.1, and embed the abstract syntax directly in the language. These\nabstract syntax representations can be used for parsing, serialization, or\nrandom testing.\n\nThe only ASN.1 encodings currently supported are BER and DER.\n","dev-repo":"git+https://github.com/mirleft/ocaml-asn1-combinators.git","doc":"https://mirleft.github.io/ocaml-asn1-combinators/doc","files-contents":{},"homepage":"https://github.com/mirleft/ocaml-asn1-combinators","isLocal":false,"license":"ISC","maintainer":"David Kaloper Meršinjak <dk505@cam.ac.uk>","name":"asn1-combinators","opam-version":"2.0","synopsis":"Embed typed ASN.1 grammars in OCaml","url":{"section":{"checksum":["sha256=012ade0d8869ef621063752c1cf8ea026f6bc702fed10df9af56688e291b1a91","sha512=4c1b28f1d230395ff1ad3b8e8d03981b10015062ec270f29e2521914eb64c2fa4d5df68363e339e9a1158c3b58aef0e25156f7ec6addd85a580fecadc17edfac"],"src":"https://github.com/mirleft/ocaml-asn1-combinators/releases/download/v0.2.6/asn1-combinators-v0.2.6.tbz"}},"version":"0.2.6","x-commit-hash":"1fc666e8b4231846cf65704ffcb09d240981dcb6"},"astring":{"authors":["The astring programmers"],"bug-reports":"https://github.com/dbuenzli/astring/issues","build":[["ocaml","pkg/pkg.ml","build","--pinned","%{pinned}%"]],"depends":[{"conditions":[{"arg":"4.05.0","prefix_relop":"geq"}],"val":"ocaml"},{"conditions":[{"id":"build"}],"val":"ocamlfind"},{"conditions":[{"id":"build"}],"val":"ocamlbuild"},{"conditions":[{"id":"build"}],"val":"topkg"}],"description":"\nAstring exposes an alternative `String` module for OCaml. This module\ntries to balance minimality and expressiveness for basic, index-free,\nstring processing and provides types and functions for substrings,\nstring sets and string maps.\n\nRemaining compatible with the OCaml `String` module is a non-goal. The\n`String` module exposed by Astring has exception safe functions,\nremoves deprecated and rarely used functions, alters some signatures\nand names, adds a few missing functions and fully exploits OCaml's\nnewfound string immutability.\n\nAstring depends only on the OCaml standard library. 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GMP lib with constant-time modular exponentiation","version":"3"},"conf-libev":{"authors":"Marc 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is modelled (very loosely) after libevent and the Event perl\nmodule, but is faster, scales better and is more correct, and also more\nfeatureful. And also smaller. Yay.","extra-files":[["discover.ml","md5=a734be402679b0ccf7c8aa60fc18bf9a"],["build.sh","md5=f37b5eb73ebeb177dff1cd8bb2f38c4e"]],"files-contents":{"build.sh":"#!/bin/sh\n\nocaml discover.ml\n","discover.ml":"(* Lightweight thread library for Objective Caml\n * http://www.ocsigen.org/lwt\n * Program discover\n * Copyright (C) 2010 Jérémie Dimino\n *\n * This program is free software; you can redistribute it and/or modify\n * it under the terms of the GNU Lesser General Public License as\n * published by the Free Software Foundation, with linking exceptions;\n * either version 2.1 of the License, or (at your option) any later\n * version. See COPYING file for details.\n *\n * This program is distributed in the hope that it will be useful, but\n * WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU\n * Lesser General Public License for more details.\n *\n * You should have received a copy of the GNU Lesser General Public\n * License along with this program; if not, write to the Free Software\n * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA\n * 02111-1307, USA.\n *)\n\n(* Discover available features *)\n\nlet cut_tail l = List.rev (List.tl (List.rev l))\n\nlet string_split sep source =\n  let copy_part index offset =\n    String.sub source index (offset - index)\n  in\n  let l = String.length source in\n  let rec loop prev current acc =\n    if current >= l then\n      List.rev acc\n    else\n      match (source.[current] = sep, current = prev, current = l - 1) with\n      | (true, true, _) -> loop (current + 1) (current + 1) acc\n      | (true, _, _) -> loop (current + 1) (current + 1) ((copy_part prev current)::acc)\n      | (false, _, true) -> loop (current + 1) (current + 1) ((copy_part prev (current + 1))::acc)\n      | _ -> loop prev (current + 1) acc\n  in loop 0 0 []\n\nlet uniq lst =\n  let unique_set = Hashtbl.create (List.length lst) in\n  List.iter (fun x -> Hashtbl.replace unique_set x ()) lst;\n  Hashtbl.fold (fun x () xs -> x :: xs) unique_set []\n\nlet get_paths env_name =\n  try\n    let paths = Sys.getenv env_name in\n    let dirs = string_split ':' paths in\n    List.map (fun dir ->\n      let components = string_split '/' dir in\n      \"/\" ^ (String.concat \"/\" (cut_tail components))\n    ) dirs\n  with Not_found -> []\n\nlet env_paths = List.append (get_paths \"LIBRARY_PATH\") (get_paths \"C_INCLUDE_PATH\")\n\n(* Keep that in sync with the list in myocamlbuild.ml *)\nlet search_paths = uniq (List.append [\n  \"/usr\";\n  \"/usr/local\";\n  \"/opt\";\n  \"/opt/local\";\n  \"/opt/homebrew\";\n  \"/sw\";\n  \"/mingw\";] env_paths)\n\nopen Printf\n\n(* +-----------------------------------------------------------------+\n   | Test codes                                                      |\n   +-----------------------------------------------------------------+ *)\n\nlet caml_code = \"\nexternal test : unit -> unit = \\\"lwt_test\\\"\nlet () = test ()\n\"\n\n\nlet libev_code = \"\n#include <caml/mlvalues.h>\n#include <ev.h>\n\nCAMLprim value lwt_test()\n{\n  ev_default_loop(0);\n  return Val_unit;\n}\n\"\n(* +-----------------------------------------------------------------+\n   | Compilation                                                     |\n   +-----------------------------------------------------------------+ *)\n\nlet ocamlc = ref \"ocamlc\"\nlet ext_obj = ref \".o\"\nlet exec_name = ref \"a.out\"\n\nlet log_file = ref \"\"\nlet caml_file = ref \"\"\n\n(* Search for a header file in standard directories. *)\nlet search_header header =\n  let rec loop = function\n    | [] ->\n        None\n    | dir :: dirs ->\n        if Sys.file_exists (dir ^ \"/include/\" ^ header) then\n          Some dir\n        else\n          loop dirs\n  in\n  loop search_paths\n\nlet c_args =\n  let flags path = Printf.sprintf \"-ccopt -I%s/include -ccopt -L%s/lib\" path path in\n  match search_header \"ev.h\" with\n    | None -> \"\"\n    | Some path -> flags path\n\nlet compile c_args args stub_file =\n  let cmd = sprintf \"%s -custom %s %s %s %s > %s 2>&1\"\n    !ocamlc\n    c_args\n    (Filename.quote stub_file)\n    args\n    (Filename.quote !caml_file)\n    (Filename.quote !log_file) in\n  Sys.command cmd = 0\n\nlet safe_remove file_name =\n  try\n    Sys.remove file_name\n  with exn ->\n    ()\n\nlet test_code args stub_code =\n  let stub_file, oc = Filename.open_temp_file \"lwt_stub\" \".c\" in\n  let cleanup () =\n    safe_remove stub_file;\n    safe_remove (Filename.chop_extension (Filename.basename stub_file) ^ !ext_obj)\n  in\n  try\n    output_string oc stub_code;\n    flush oc;\n    close_out oc;\n    let result = compile \"\" args stub_file || compile c_args args stub_file in\n    cleanup ();\n    result\n  with exn ->\n    (try close_out oc with _ -> ());\n    cleanup ();\n    raise exn\n\nlet config = open_out \"lwt_config.h\"\nlet config_ml = open_out \"lwt_config.ml\"\n\nlet test_feature ?(do_check = true) name macro ?(args=\"\") code =\n  if do_check then begin\n    printf \"testing for %s:%!\" name;\n    if test_code args code then begin\n      fprintf config \"#define %s\\n\" macro;\n      fprintf config_ml \"#let %s = true\\n\" macro;\n      printf \" %s available\\n%!\" (String.make (34 - String.length name) '.');\n      true\n    end else begin\n      fprintf config \"//#define %s\\n\" macro;\n      fprintf config_ml \"#let %s = false\\n\" macro;\n      printf \" %s unavailable\\n%!\" (String.make (34 - String.length name) '.');\n      false\n    end\n  end else begin\n    printf \"not checking for %s\\n%!\" name;\n    fprintf config \"//#define %s\\n\" macro;\n    fprintf config_ml \"#let %s = false\\n\" macro;\n    true\n  end\n\n(* +-----------------------------------------------------------------+\n   | Entry point                                                     |\n   +-----------------------------------------------------------------+ *)\n\nlet () =\n  let args = [\n    \"-ocamlc\", Arg.Set_string ocamlc, \"<path> ocamlc\";\n    \"-ext-obj\", Arg.Set_string ext_obj, \"<ext> C object files extension\";\n    \"-exec-name\", Arg.Set_string exec_name, \"<name> name of the executable produced by ocamlc\";\n  ] in\n  Arg.parse args ignore \"check for external C libraries and available features\\noptions are:\";\n\n  (* Put the caml code into a temporary file. *)\n  let file, oc = Filename.open_temp_file \"lwt_caml\" \".ml\" in\n  caml_file := file;\n  output_string oc caml_code;\n  close_out oc;\n\n  log_file := Filename.temp_file \"lwt_output\" \".log\";\n\n  (* Cleanup things on exit. *)\n  at_exit (fun () ->\n             (try close_out config with _ -> ());\n             (try close_out config_ml with _ -> ());\n             safe_remove !log_file;\n             safe_remove !exec_name;\n             safe_remove !caml_file;\n             safe_remove (Filename.chop_extension !caml_file ^ \".cmi\");\n             safe_remove (Filename.chop_extension !caml_file ^ \".cmo\"));\n\n  let missing = [] in\n  let missing = if test_feature \"libev\" \"HAVE_LIBEV\" ~args:\"-cclib -lev\" libev_code then missing else \"libev\" :: missing in\n\n  if missing <> [] then begin\n    printf \"\n      The following recquired C libraries are missing: %s.\nPlease install them and retry. 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\ No newline at end of file
diff --git a/scripts/add-dependency.sh b/scripts/add-dependency.sh
new file mode 100755
index 0000000..2f941ff
--- /dev/null
+++ b/scripts/add-dependency.sh
@@ -0,0 +1,17 @@
+#!/bin/sh
+
+# This script adds a dependency to the project.
+set -e
+
+NEW_DEP=$1
+
+# Add argument to dune-project after the word (depends 
+# So (depends dune dream ppx becomes (depends dune dream ppx NEW_DEP
+sed -i "s/\(depends.*\)/\1 $NEW_DEP/" dune-project
+
+# Run dune to update the project
+dune build ann_bloop.opam 
+
+
+# Run cat to generate a new package-deps.json
+cat $(nix eval .#package-defs --raw) > package-defs.json
diff --git a/scripts/run-test-watch.sh b/scripts/run-test-watch.sh
new file mode 100755
index 0000000..9190a39
--- /dev/null
+++ b/scripts/run-test-watch.sh
@@ -0,0 +1 @@
+dune runtest --watch --root . --profile release --no-buffer --force
diff --git a/scripts/run-watch.sh b/scripts/run-watch.sh
new file mode 100755
index 0000000..4558e2d
--- /dev/null
+++ b/scripts/run-watch.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+dune exec --watch --root . --profile release -- ./bin/main.exe
diff --git a/test/ann_bloop.ml b/test/ann_bloop.ml
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/test/ann_bloop.ml
diff --git a/test/dune b/test/dune
new file mode 100644
index 0000000..bfa3196
--- /dev/null
+++ b/test/dune
@@ -0,0 +1,2 @@
+(test
+ (name ann_bloop))