commit 11ed808373993dc79f03fec7424e2cf110f7eb78
Author: Christine Dodrill <me@christine.website>
Date:   Fri Jul 3 20:47:30 2020 -0400

    initial implementation

diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..051d09d
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+eval "$(lorri direnv)"
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..fedaa2b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
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diff --git a/Cargo.lock b/Cargo.lock
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index 0000000..4858ee7
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..0014f47
--- /dev/null
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+log = "0.4"
+pretty_env_logger = "0.4"
+regex = "1"
+serde = { version = "1", features = ["derive"] }
+serde_dhall = "0.5.3"
+tokio = { version = "0.2", features = ["macros"] }
+
+# git deps
+discord_webhook = { git = "https://github.com/Xe/withinbot", branch = "main"}
+furbooru = { git = "https://github.com/Xe/furbooru" }
diff --git a/nix/sources.json b/nix/sources.json
new file mode 100644
index 0000000..a92283a
--- /dev/null
+++ b/nix/sources.json
@@ -0,0 +1,38 @@
+{
+    "easy-dhall-nix": {
+        "branch": "master",
+        "description": "Derivations for easily downloading Dhall binaries and putting them to use.",
+        "homepage": "",
+        "owner": "justinwoo",
+        "repo": "easy-dhall-nix",
+        "rev": "288ee825c326f352a5db194a024bd3e1f2f735b2",
+        "sha256": "12v4ql1nm1famz8r80k1xkkdgj7285vy2vn16iili0qwvz3i98ah",
+        "type": "tarball",
+        "url": "https://github.com/justinwoo/easy-dhall-nix/archive/288ee825c326f352a5db194a024bd3e1f2f735b2.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
+    "niv": {
+        "branch": "master",
+        "description": "Easy dependency management for Nix projects",
+        "homepage": "https://github.com/nmattia/niv",
+        "owner": "nmattia",
+        "repo": "niv",
+        "rev": "f73bf8d584148677b01859677a63191c31911eae",
+        "sha256": "0jlmrx633jvqrqlyhlzpvdrnim128gc81q5psz2lpp2af8p8q9qs",
+        "type": "tarball",
+        "url": "https://github.com/nmattia/niv/archive/f73bf8d584148677b01859677a63191c31911eae.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
+    "nixpkgs": {
+        "branch": "nixpkgs-unstable",
+        "description": "A read-only mirror of NixOS/nixpkgs tracking the released channels. Send issues and PRs to",
+        "homepage": "https://github.com/NixOS/nixpkgs",
+        "owner": "NixOS",
+        "repo": "nixpkgs-channels",
+        "rev": "2676464121007b3fde6d96d0d5a843e42f1f6adb",
+        "sha256": "0mzcazkgnpini5lflmdn1pp05i6h3jbxlj5fs6j48mfv1z5qglb8",
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs-channels/archive/2676464121007b3fde6d96d0d5a843e42f1f6adb.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    }
+}
diff --git a/nix/sources.nix b/nix/sources.nix
new file mode 100644
index 0000000..8a725cb
--- /dev/null
+++ b/nix/sources.nix
@@ -0,0 +1,134 @@
+# This file has been generated by Niv.
+
+let
+
+  #
+  # The fetchers. fetch_<type> fetches specs of type <type>.
+  #
+
+  fetch_file = pkgs: spec:
+    if spec.builtin or true then
+      builtins_fetchurl { inherit (spec) url sha256; }
+    else
+      pkgs.fetchurl { inherit (spec) url sha256; };
+
+  fetch_tarball = pkgs: spec:
+    if spec.builtin or true then
+      builtins_fetchTarball { inherit (spec) url sha256; }
+    else
+      pkgs.fetchzip { inherit (spec) url sha256; };
+
+  fetch_git = spec:
+    builtins.fetchGit { url = spec.repo; inherit (spec) rev ref; };
+
+  fetch_builtin-tarball = spec:
+    builtins.trace
+      ''
+        WARNING:
+          The niv type "builtin-tarball" will soon be deprecated. You should
+          instead use `builtin = true`.
+
+          $ niv modify <package> -a type=tarball -a builtin=true
+      ''
+      builtins_fetchTarball { inherit (spec) url sha256; };
+
+  fetch_builtin-url = spec:
+    builtins.trace
+      ''
+        WARNING:
+          The niv type "builtin-url" will soon be deprecated. You should
+          instead use `builtin = true`.
+
+          $ niv modify <package> -a type=file -a builtin=true
+      ''
+      (builtins_fetchurl { inherit (spec) url sha256; });
+
+  #
+  # Various helpers
+  #
+
+  # The set of packages used when specs are fetched using non-builtins.
+  mkPkgs = sources:
+    let
+      sourcesNixpkgs =
+        import (builtins_fetchTarball { inherit (sources.nixpkgs) url sha256; }) {};
+      hasNixpkgsPath = builtins.any (x: x.prefix == "nixpkgs") builtins.nixPath;
+      hasThisAsNixpkgsPath = <nixpkgs> == ./.;
+    in
+      if builtins.hasAttr "nixpkgs" sources
+      then sourcesNixpkgs
+      else if hasNixpkgsPath && ! hasThisAsNixpkgsPath then
+        import <nixpkgs> {}
+      else
+        abort
+          ''
+            Please specify either <nixpkgs> (through -I or NIX_PATH=nixpkgs=...) or
+            add a package called "nixpkgs" to your sources.json.
+          '';
+
+  # The actual fetching function.
+  fetch = pkgs: name: spec:
+
+    if ! builtins.hasAttr "type" spec then
+      abort "ERROR: niv spec ${name} does not have a 'type' attribute"
+    else if spec.type == "file" then fetch_file pkgs spec
+    else if spec.type == "tarball" then fetch_tarball pkgs spec
+    else if spec.type == "git" then fetch_git spec
+    else if spec.type == "builtin-tarball" then fetch_builtin-tarball spec
+    else if spec.type == "builtin-url" then fetch_builtin-url spec
+    else
+      abort "ERROR: niv spec ${name} has unknown type ${builtins.toJSON spec.type}";
+
+  # Ports of functions for older nix versions
+
+  # a Nix version of mapAttrs if the built-in doesn't exist
+  mapAttrs = builtins.mapAttrs or (
+    f: set: with builtins;
+    listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set))
+  );
+
+  # fetchTarball version that is compatible between all the versions of Nix
+  builtins_fetchTarball = { url, sha256 }@attrs:
+    let
+      inherit (builtins) lessThan nixVersion fetchTarball;
+    in
+      if lessThan nixVersion "1.12" then
+        fetchTarball { inherit url; }
+      else
+        fetchTarball attrs;
+
+  # fetchurl version that is compatible between all the versions of Nix
+  builtins_fetchurl = { url, sha256 }@attrs:
+    let
+      inherit (builtins) lessThan nixVersion fetchurl;
+    in
+      if lessThan nixVersion "1.12" then
+        fetchurl { inherit url; }
+      else
+        fetchurl attrs;
+
+  # Create the final "sources" from the config
+  mkSources = config:
+    mapAttrs (
+      name: spec:
+        if builtins.hasAttr "outPath" spec
+        then abort
+          "The values in sources.json should not have an 'outPath' attribute"
+        else
+          spec // { outPath = fetch config.pkgs name spec; }
+    ) config.sources;
+
+  # The "config" used by the fetchers
+  mkConfig =
+    { sourcesFile ? ./sources.json
+    , sources ? builtins.fromJSON (builtins.readFile sourcesFile)
+    , pkgs ? mkPkgs sources
+    }: rec {
+      # The sources, i.e. the attribute set of spec name to spec
+      inherit sources;
+
+      # The "pkgs" (evaluated nixpkgs) to use for e.g. non-builtin fetchers
+      inherit pkgs;
+    };
+in
+mkSources (mkConfig {}) // { __functor = _: settings: mkSources (mkConfig settings); }
diff --git a/regexes.dhall b/regexes.dhall
new file mode 100644
index 0000000..317205f
--- /dev/null
+++ b/regexes.dhall
@@ -0,0 +1,6 @@
+let Rule =
+      { Type = { regex : Text, why : Text }
+      , default = { regex = "", why = "" }
+      }
+
+in  [ Rule::{ regex = "(n|z)igg(er|a)", why = "racism" } ]
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..9963fb7
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,18 @@
+{ sources ? import ./nix/sources.nix, pkgs ? import sources.nixpkgs { }
+, dhall ? import sources.easy-dhall-nix { } }:
+
+pkgs.mkShell {
+  buildInputs = with pkgs; [
+    cargo
+    cargo-watch
+    rls
+    rustc
+    rustfmt
+
+    dhall.dhall-simple
+
+    # system
+    openssl
+    pkg-config
+  ];
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..2020e9e
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,115 @@
+use anyhow::Result;
+use async_trait::async_trait;
+use discord_webhook::Body;
+use furbooru::{Client, Comment, FirehoseAdaptor, Image};
+use regex::Regex;
+use serde::Deserialize;
+
+#[derive(Deserialize, Debug, Clone)]
+pub(crate) struct Config {
+    discord_webhook_url: String,
+    furbooru_api_key: String,
+    bot_owner_furbooru_account: String,
+    regexes: std::path::PathBuf,
+}
+
+impl Config {}
+
+#[derive(Deserialize, Debug, Clone)]
+pub(crate) struct Rule {
+    regex: String,
+    why: String,
+}
+
+struct CompiledRule {
+    regex: Regex,
+    raw: String,
+    why: String,
+}
+
+pub(crate) fn user_agent(username: String) -> String {
+    format!(
+        "{}/{} ({}, +{})",
+        env!("CARGO_PKG_NAME"),
+        env!("CARGO_PKG_VERSION"),
+        username,
+        env!("CARGO_PKG_REPOSITORY")
+    )
+}
+
+struct Rules(Vec<CompiledRule>, Config);
+
+#[async_trait]
+impl FirehoseAdaptor for Rules {
+    async fn image_created(&self, img: Image) -> Result<()> {
+        let mut buf: String = String::new();
+        let mut found = false;
+
+        for rule in &self.0 {
+            if rule.regex.is_match(&img.description) {
+                found = true;
+                buf.push_str(&format!("\n- match on rule {} ({})", rule.raw, rule.why));
+            }
+        }
+
+        if found {
+            discord_webhook::execute(
+                self.1.discord_webhook_url.clone(),
+                Body::new(format!("matches found on {}: \n{}", img.view_url, buf)),
+            )
+            .await?;
+        }
+
+        Ok(())
+    }
+
+    async fn comment_created(&self, cmt: Comment) -> Result<()> {
+        let mut buf: String = String::new();
+        let mut found = false;
+
+        for rule in &self.0 {
+            if rule.regex.is_match(&cmt.body) {
+                found = true;
+                buf.push_str(&format!("\n- match on rule {} ({})", rule.raw, rule.why));
+            }
+        }
+
+        if found {
+            discord_webhook::execute(
+                self.1.discord_webhook_url.clone(),
+                Body::new(format!(
+                    "matches found on https://furbooru.org/{}#comment_{}: \n{}",
+                    cmt.image_id, cmt.id, buf
+                )),
+            )
+            .await?;
+        }
+
+        Ok(())
+    }
+}
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    kankyo::init()?;
+    pretty_env_logger::init();
+    let cfg: Config = envy::from_env()?;
+    let rexes: Vec<Rule> = serde_dhall::from_file(cfg.regexes.clone()).parse()?;
+    let mut compiled_rules: Vec<CompiledRule> = Vec::new();
+
+    for rule in rexes {
+        compiled_rules.push(CompiledRule {
+            raw: rule.regex.clone(),
+            regex: Regex::new(rule.regex.as_str())?,
+            why: rule.why,
+        })
+    }
+
+    let cli = Client::new(
+        user_agent(cfg.bot_owner_furbooru_account.clone()),
+        cfg.furbooru_api_key.clone(),
+    )?;
+    cli.firehose(Rules(compiled_rules, cfg)).await?;
+
+    Ok(())
+}