Merge branch 'federation' into dev_1

2024-11-22 06:36:14 +00:00 · 2020-02-05 12:51:03 -05:00 · 2020-02-05 12:51:03 -05:00 · d932acad16
parent 420fb5a847 eaf548b5db
commit d932acad16
15 changed files with 799 additions and 42 deletions
--- a/.dockerignore
+++ b/.dockerignore
@ -1,4 +1,6 @@
 ui/node_modules
-ui/dist
-server/target
+server/target/debug
+!server/target/debug/lemmy_server
+server/target/release
+server/target/debug/incremental
 .git
--- a/docker/federation-test/Dockerfile
+++ b/docker/federation-test/Dockerfile
@ -0,0 +1,16 @@
+FROM ekidd/rust-musl-builder:1.38.0-openssl11
+
+# Copy resources
+COPY server/config/defaults.hjson /app/config/defaults.hjson
+COPY server/target/debug/lemmy_server /app/lemmy
+COPY ui/dist /app/dist
+
+USER root
+RUN mkdir /app/dist/documentation/
+RUN addgroup --gid 1001 lemmy
+RUN adduser --disabled-password --shell /bin/sh -u 1001 --ingroup lemmy lemmy
+RUN chown lemmy:lemmy /app/ -R
+USER lemmy
+EXPOSE 8536
+WORKDIR /app
+CMD ["/app/lemmy"]
--- a/docker/federation-test/docker-compose.yml
+++ b/docker/federation-test/docker-compose.yml
@ -0,0 +1,74 @@
+version: '3.3'
+
+services:
+  lemmy_alpha:
+    image: lemmy-federation-test:latest
+    ports:
+      - "127.0.0.1:8540:8540"
+    environment:
+      - LEMMY_HOSTNAME=localhost:8540
+      - LEMMY_DATABASE_URL=postgres://lemmy:password@lemmy_db_alpha:5432/lemmy
+      - LEMMY_JWT_SECRET=changeme
+      - LEMMY_FRONT_END_DIR=/app/dist
+      - LEMMY_FEDERATION_ENABLED=true
+      - LEMMY_FEDERATED_INSTANCE=lemmy_beta:8541
+      - LEMMY_PORT=8540
+      - RUST_BACKTRACE=1
+    restart: always
+    depends_on:
+      - lemmy_db_alpha
+  lemmy_db_alpha:
+    image: postgres:12-alpine
+    environment:
+      - POSTGRES_USER=lemmy
+      - POSTGRES_PASSWORD=${LEMMY_DATABASE_PASSWORD}
+      - POSTGRES_DB=lemmy
+    volumes:
+      - lemmy_db_alpha:/var/lib/postgresql/data
+    restart: always
+  # lemmy_pictshare_alpha:
+  #   image: shtripok/pictshare:latest
+  #   ports:
+  #     - "127.0.0.1:8550:80"
+  #   volumes:
+  #     - lemmy_pictshare_alpha:/usr/share/nginx/html/data
+  #   restart: always
+
+  lemmy_beta:
+    image: lemmy-federation-test:latest
+    ports:
+      - "127.0.0.1:8541:8541"
+    environment:
+      - LEMMY_HOSTNAME=localhost:8541
+      - LEMMY_DATABASE_URL=postgres://lemmy:password@lemmy_db_beta:5432/lemmy
+      - LEMMY_JWT_SECRET=changeme
+      - LEMMY_FRONT_END_DIR=/app/dist
+      - LEMMY_FEDERATION_ENABLED=true
+      - LEMMY_FEDERATED_INSTANCE=lemmy_alpha:8540
+      - LEMMY_PORT=8541
+      - RUST_BACKTRACE=1
+    restart: always
+    depends_on:
+      - lemmy_db_beta
+  lemmy_db_beta:
+    image: postgres:12-alpine
+    environment:
+      - POSTGRES_USER=lemmy
+      - POSTGRES_PASSWORD=${LEMMY_DATABASE_PASSWORD}
+      - POSTGRES_DB=lemmy
+    volumes:
+      - lemmy_db_beta:/var/lib/postgresql/data
+    restart: always
+  # lemmy_pictshare_beta:
+  #   image: shtripok/pictshare:latest
+  #   ports:
+  #     - "127.0.0.1:8551:80"
+  #   volumes:
+  #     - lemmy_pictshare_beta:/usr/share/nginx/html/data
+  #   restart: always
+
+volumes:
+  lemmy_db_alpha:
+  # lemmy_pictshare_alpha:
+  lemmy_db_beta:
+  # lemmy_pictshare_beta:
--- a/docker/federation-test/run-federation-test.bash
+++ b/docker/federation-test/run-federation-test.bash
@ -0,0 +1,14 @@
+#!/bin/bash
+set -e
+
+pushd ../../ui/ || exit
+yarn build
+popd || exit
+
+pushd ../../server/ || exit
+cargo build
+popd || exit
+
+sudo docker build ../../ -f Dockerfile -t lemmy-federation-test:latest
+
+sudo docker-compose up
--- a/server/Cargo.lock
+++ b/server/Cargo.lock
@ -586,6 +586,16 @@ name = "byteorder"
 version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"

+[[package]]
+name = "bytes"
+version = "0.4.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "iovec 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "bytes"
 version = "0.5.3"
@ -651,6 +661,32 @@ dependencies = [
 "yaml-rust 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

+[[package]]
+name = "cookie"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "cookie_store"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cookie 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "idna 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "publicsuffix 1.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "try_from 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "copyless"
 version = "0.1.4"
@ -686,6 +722,45 @@ dependencies = [
 "crossbeam-utils 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

+[[package]]
+name = "crossbeam-deque"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-epoch 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-epoch"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "autocfg 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memoffset 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scopeguard 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-queue"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-utils 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.6.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "crossbeam-utils"
 version = "0.7.0"
@ -934,6 +1009,14 @@ dependencies = [
 "termcolor 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

+[[package]]
+name = "error-chain"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "failure"
 version = "0.1.6"
@ -1015,6 +1098,11 @@ name = "fuchsia-zircon-sys"
 version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"

+[[package]]
+name = "futures"
+version = "0.1.29"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "futures"
 version = "0.3.1"
@ -1043,6 +1131,15 @@ name = "futures-core"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"

+[[package]]
+name = "futures-cpupool"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 1.11.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "futures-executor"
 version = "0.3.1"
@ -1123,6 +1220,23 @@ dependencies = [
 "wasi 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

+[[package]]
+name = "h2"
+version = "0.1.26"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "indexmap 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "string 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "h2"
 version = "0.2.1"
@ -1182,6 +1296,16 @@ name = "htmlescape"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"

+[[package]]
+name = "http"
+version = "0.1.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "http"
 version = "0.2.0"
@ -1192,6 +1316,17 @@ dependencies = [
 "itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

+[[package]]
+name = "http-body"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-buf 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "httparse"
 version = "1.3.4"
@ -1205,11 +1340,62 @@ dependencies = [
 "quick-error 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

+[[package]]
+name = "hyper"
+version = "0.12.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "h2 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http-body 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "httparse 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "iovec 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.1.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-buf 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-executor 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-reactor 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-tcp 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-threadpool 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-timer 0.2.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "want 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "hyper-tls"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.12.35 (registry+https://github.com/rust-lang/crates.io-index)",
+ "native-tls 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "ident_case"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"

+[[package]]
+name = "idna"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "matches 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-bidi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-normalization 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "idna"
 version = "0.2.0"
@ -1328,6 +1514,7 @@ dependencies = [
 "lettre_email 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
 "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
 "regex 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "reqwest 0.9.24 (registry+https://github.com/rust-lang/crates.io-index)",
 "rss 1.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
 "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
 "serde_json 1.0.45 (registry+https://github.com/rust-lang/crates.io-index)",
@ -1426,6 +1613,11 @@ name = "matches"
 version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"

+[[package]]
+name = "maybe-uninit"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "memchr"
 version = "0.1.11"
@ -1439,6 +1631,14 @@ name = "memchr"
 version = "2.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"

+[[package]]
+name = "memoffset"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "migrations_internals"
 version = "1.4.0"
@ -1649,6 +1849,16 @@ dependencies = [
 "vcpkg 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

+[[package]]
+name = "parking_lot"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lock_api 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot_core 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "parking_lot"
 version = "0.10.0"
@ -1658,6 +1868,20 @@ dependencies = [
 "parking_lot_core 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

+[[package]]
+name = "parking_lot_core"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "parking_lot_core"
 version = "0.7.0"
@ -1681,6 +1905,11 @@ dependencies = [
 "regex 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

+[[package]]
+name = "percent-encoding"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "percent-encoding"
 version = "2.1.0"
@ -1755,6 +1984,18 @@ dependencies = [
 "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

+[[package]]
+name = "publicsuffix"
+version = "1.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "error-chain 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "idna 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "quick-error"
 version = "1.2.3"
@ -1986,6 +2227,39 @@ dependencies = [
 "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]

+[[package]]
+name = "reqwest"
+version = "0.9.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "base64 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cookie 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cookie_store 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "encoding_rs 0.8.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "flate2 1.0.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.12.35 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper-tls 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mime 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mime_guess 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "native-tls 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
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+ "serde_json 1.0.45 (registry+https://github.com/rust-lang/crates.io-index)",
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--- a/server/Cargo.toml
+++ b/server/Cargo.toml
@ -33,3 +33,4 @@ rss = "1.9.0"
 htmlescape = "0.3.1"
 config = "0.10.1"
 hjson = "0.8.2"
+reqwest = "0.9.24"
--- a/server/config/config.hjson
+++ b/server/config/config.hjson
@ -0,0 +1,4 @@
+{
+  hostname: "localhost:8536"
+  federation_enabled: true
+}
--- a/server/config/defaults.hjson
+++ b/server/config/defaults.hjson
@ -15,7 +15,7 @@
    pool_size: 5
  }
  # the domain name of your instance (eg "dev.lemmy.ml")
-  hostname: "my_domain"
+  hostname: null
  # address where lemmy should listen for incoming requests
  bind: "0.0.0.0"
  # port where lemmy should listen for incoming requests
@ -24,9 +24,11 @@
  jwt_secret: "changeme"
  # The dir for the front end
  front_end_dir: "../ui/dist"
-  # whether to enable activitypub federation. this feature is in alpha, do not enable in production, as might
-  # cause problems like remote instances fetching and permanently storing bad data.
+  # whether to enable activitypub federation. this feature is in alpha, do not enable in production.
  federation_enabled: false
+  // another instance to federate with. this should be a list, but it seems like lists cant be set from environment
+  // https://github.com/mehcode/config-rs/issues/117
+  federated_instance: null
  # rate limits for various user actions, by user ip
  rate_limit: {
    # maximum number of messages created in interval
--- a/server/src/api/community.rs
+++ b/server/src/api/community.rs
@ -5,15 +5,15 @@ use std::str::FromStr;
 #[derive(Serialize, Deserialize)]
 pub struct GetCommunity {
  id: Option<i32>,
-  name: Option<String>,
+  pub name: Option<String>,
  auth: Option<String>,
 }

 #[derive(Serialize, Deserialize)]
 pub struct GetCommunityResponse {
  pub community: CommunityView,
-  moderators: Vec<CommunityModeratorView>,
-  admins: Vec<UserView>,
+  pub moderators: Vec<CommunityModeratorView>,
+  pub admins: Vec<UserView>,
  pub online: usize,
 }

@ -40,9 +40,9 @@ pub struct ListCommunities {
  auth: Option<String>,
 }

-#[derive(Serialize, Deserialize)]
+#[derive(Serialize, Deserialize, Debug)]
 pub struct ListCommunitiesResponse {
-  communities: Vec<CommunityView>,
+  pub communities: Vec<CommunityView>,
 }

 #[derive(Serialize, Deserialize, Clone)]
--- a/server/src/apub/mod.rs
+++ b/server/src/apub/mod.rs
@ -1,5 +1,6 @@
 pub mod community;
 pub mod post;
+pub mod puller;
 pub mod user;
 use crate::Settings;

--- a/server/src/apub/puller.rs
+++ b/server/src/apub/puller.rs
@ -0,0 +1,97 @@
+extern crate reqwest;
+
+use self::reqwest::Error;
+use crate::api::community::{GetCommunityResponse, ListCommunitiesResponse};
+use crate::api::post::GetPosts;
+use crate::db::community_view::CommunityView;
+use crate::naive_now;
+use crate::settings::Settings;
+use activitypub::actor::Group;
+
+// TODO: right now all of the data is requested on demand, for production we will need to store
+//       things in the local database to not ruin the performance
+
+fn fetch_communities_from_instance(domain: &str) -> Result<Vec<CommunityView>, Error> {
+  // TODO: check nodeinfo to make sure we are dealing with a lemmy instance
+  //       -> means we need proper nodeinfo json classes instead of inline generation
+  // TODO: follow pagination (seems like page count is missing?)
+  // TODO: see if there is any standard for discovering remote actors, so we dont have to rely on lemmy apis
+  let communities_uri = format!("http://{}/api/v1/communities/list?sort=Hot", domain);
+  let communities1: ListCommunitiesResponse = reqwest::get(&communities_uri)?.json()?;
+  let mut communities2 = communities1.communities;
+  for c in &mut communities2 {
+    c.name = format_community_name(&c.name, domain);
+  }
+  Ok(communities2)
+}
+
+pub fn get_remote_community_posts(name: String) -> Result<GetPosts, Error> {
+  // TODO: this is for urls like /c/!main@example.com, activitypub exposes it through the outbox
+  //       https://www.w3.org/TR/activitypub/#outbox
+  dbg!(name);
+  unimplemented!()
+}
+
+pub fn get_remote_community(identifier: String) -> Result<GetCommunityResponse, Error> {
+  let x: Vec<&str> = identifier.split('@').collect();
+  let name = x[0].replace("!", "");
+  let instance = x[1];
+  let community_uri = format!("http://{}/federation/c/{}", instance, name);
+  let community: Group = reqwest::get(&community_uri)?.json()?;
+
+  // TODO: looks like a bunch of data is missing from the activitypub response
+  // TODO: i dont think simple numeric ids are going to work, we probably need something like uuids
+  // TODO: why are the Group properties not typed?
+  Ok(GetCommunityResponse {
+    moderators: vec![],
+    admins: vec![],
+    community: CommunityView {
+      id: -1,
+      name: identifier.clone(),
+      title: identifier,
+      description: community.object_props.summary.map(|c| c.to_string()),
+      category_id: -1,
+      creator_id: -1,
+      removed: false,
+      published: naive_now(),     // TODO: community.object_props.published
+      updated: Some(naive_now()), // TODO: community.object_props.updated
+      deleted: false,
+      nsfw: false,
+      creator_name: "".to_string(),
+      creator_avatar: None,
+      category_name: "".to_string(),
+      number_of_subscribers: -1,
+      number_of_posts: -1,
+      number_of_comments: -1,
+      hot_rank: -1,
+      user_id: None,
+      subscribed: None,
+    },
+    online: 0,
+  })
+}
+
+pub fn get_following_instances() -> Result<Vec<String>, Error> {
+  let instance_list = match Settings::get().federated_instance.clone() {
+    Some(f) => vec![f, Settings::get().hostname.clone()],
+    None => vec![Settings::get().hostname.clone()],
+  };
+  Ok(instance_list)
+}
+
+pub fn get_all_communities() -> Result<Vec<CommunityView>, Error> {
+  let mut communities_list: Vec<CommunityView> = vec![];
+  for instance in &get_following_instances()? {
+    communities_list.append(fetch_communities_from_instance(instance)?.as_mut());
+  }
+  Ok(communities_list)
+}
+
+/// If community is on local instance, don't include the @instance part
+pub fn format_community_name(name: &str, instance: &str) -> String {
+  if instance == Settings::get().hostname {
+    format!("!{}", name)
+  } else {
+    format!("!{}@{}", name, instance)
+  }
+}
--- a/server/src/routes/federation.rs
+++ b/server/src/routes/federation.rs
@ -1,18 +1,42 @@
+use crate::api::community::ListCommunities;
+use crate::api::Oper;
+use crate::api::Perform;
 use crate::apub;
-use actix_web::web;
+use crate::settings::Settings;
+use actix_web::web::Query;
+use actix_web::{web, HttpResponse};
+use diesel::r2d2::{ConnectionManager, Pool};
+use diesel::PgConnection;

 pub fn config(cfg: &mut web::ServiceConfig) {
-  cfg
-    .route(
-      "/federation/c/{community_name}",
-      web::get().to(apub::community::get_apub_community),
-    )
-    .route(
-      "/federation/c/{community_name}/followers",
-      web::get().to(apub::community::get_apub_community_followers),
-    )
-    .route(
-      "/federation/u/{user_name}",
-      web::get().to(apub::user::get_apub_user),
-    );
+  if Settings::get().federation_enabled {
+    println!("federation enabled, host is {}", Settings::get().hostname);
+    cfg
+      .route(
+        "/federation/c/{community_name}",
+        web::get().to(apub::community::get_apub_community),
+      )
+      .route(
+        "/federation/c/{community_name}/followers",
+        web::get().to(apub::community::get_apub_community_followers),
+      )
+      .route(
+        "/federation/u/{user_name}",
+        web::get().to(apub::user::get_apub_user),
+      )
+      // TODO: this is a very quick and dirty implementation for http api calls
+      .route(
+        "/api/v1/communities/list",
+        web::get().to(
+          |query: Query<ListCommunities>, db: web::Data<Pool<ConnectionManager<PgConnection>>>| {
+            let res = Oper::new(query.into_inner())
+              .perform(&db.get().unwrap())
+              .unwrap();
+            HttpResponse::Ok()
+              .content_type("application/json")
+              .body(serde_json::to_string(&res).unwrap())
+          },
+        ),
+      );
+  }
 }
--- a/server/src/routes/webfinger.rs
+++ b/server/src/routes/webfinger.rs
@ -71,22 +71,22 @@ async fn get_webfinger_response(
      community_url,
    ],
    "links": [
-    {
-      "rel": "http://webfinger.net/rel/profile-page",
-      "type": "text/html",
-      "href": community_url
-    },
-    {
-      "rel": "self",
-      "type": "application/activity+json",
-      // Yes this is correct, this link doesn't include the `.json` extension
-      "href": community_url
-    }
-    // TODO: this also needs to return the subscribe link once that's implemented
-    //{
-    //  "rel": "http://ostatus.org/schema/1.0/subscribe",
-    //  "template": "https://my_instance.com/authorize_interaction?uri={uri}"
-    //}
+      {
+        "rel": "http://webfinger.net/rel/profile-page",
+        "type": "text/html",
+        "href": community.get_url(),
+      },
+      {
+        "rel": "self",
+        "type": "application/activity+json",
+        // Yes this is correct, this link doesn't include the `.json` extension
+        "href": community_url
+      }
+      // TODO: this also needs to return the subscribe link once that's implemented
+      //{
+      //  "rel": "http://ostatus.org/schema/1.0/subscribe",
+      //  "template": "https://my_instance.com/authorize_interaction?uri={uri}"
+      //}
    ]
    }))
  })
--- a/server/src/settings.rs
+++ b/server/src/settings.rs
@ -18,6 +18,7 @@ pub struct Settings {
  pub rate_limit: RateLimitConfig,
  pub email: Option<EmailConfig>,
  pub federation_enabled: bool,
+  pub federated_instance: Option<String>,
 }

 #[derive(Debug, Deserialize)]
--- a/server/src/websocket/server.rs
+++ b/server/src/websocket/server.rs
@ -19,6 +19,7 @@ use crate::api::post::*;
 use crate::api::site::*;
 use crate::api::user::*;
 use crate::api::*;
+use crate::apub::puller::*;
 use crate::websocket::UserOperation;
 use crate::Settings;

@ -486,7 +487,24 @@ fn parse_json_message(chat: &mut ChatServer, msg: StandardMessage) -> Result<Str
    }
    UserOperation::GetCommunity => {
      let get_community: GetCommunity = serde_json::from_str(data)?;
-      let mut res = Oper::new(get_community).perform(&conn)?;
+
+      let mut res = if Settings::get().federation_enabled {
+        if let Some(community_name) = get_community.name.to_owned() {
+          if community_name.contains('@') {
+            // TODO: need to support sort, filter etc for remote communities
+            get_remote_community(community_name)?
+          // TODO what is this about
+          // get_community.name = Some(name.replace("!", ""));
+          } else {
+            Oper::new(get_community).perform(&conn)?
+          }
+        } else {
+          Oper::new(get_community).perform(&conn)?
+        }
+      } else {
+        Oper::new(get_community).perform(&conn)?
+      };
+
      let community_id = res.community.id;

      chat.join_community_room(community_id, msg.id);
@ -500,7 +518,13 @@ fn parse_json_message(chat: &mut ChatServer, msg: StandardMessage) -> Result<Str
      to_json_string(&user_operation, &res)
    }
    UserOperation::ListCommunities => {
-      do_user_operation::<ListCommunities, ListCommunitiesResponse>(user_operation, data, &conn)
+      if Settings::get().federation_enabled {
+        let res = get_all_communities()?;
+        let val = ListCommunitiesResponse { communities: res };
+        to_json_string(&user_operation, &val)
+      } else {
+        do_user_operation::<ListCommunities, ListCommunitiesResponse>(user_operation, data, &conn)
+      }
    }
    UserOperation::CreateCommunity => {
      chat.check_rate_limit_register(msg.id)?;