feat(api): server-rendered OG image of all-time contribution graph

Add /v1/og/contributions.png endpoint that builds an SVG of the
all-time weekly contribution graph (one row per year) from daily
counts, then rasterizes to PNG via resvg. Served with 1h cache.

Add og:image and twitter:card meta tags to index.html pointing at
the endpoint.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -88,6 +88,18 @@ version = "1.0.102"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7f202df86484c868dbad7eaa557ef785d5c66295e41b460ef922eca0723b842c"
 
+[[package]]
+name = "arrayref"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "76a2e8124351fda1ef8aaaa3bbd7ebbcb486bbcd4225aca0aa0d84bb2db8fecb"
+
+[[package]]
+name = "arrayvec"
+version = "0.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7c02d123df017efcdfbd739ef81735b36c5ba83ec3c59c80a9d7ecc718f92e50"
+
 [[package]]
 name = "async-compression"
 version = "0.4.42"
@@ -196,6 +208,12 @@ version = "1.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2af50177e190e07a26ab74f8b1efbfe2ef87da2116221318cb1c2e82baf7de06"
 
+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
 [[package]]
 name = "bitflags"
 version = "2.11.1"
@@ -220,12 +238,24 @@ version = "3.20.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5d20789868f4b01b2f2caec9f5c4e0213b41e3e5702a50157d699ae31ced2fcb"
 
+[[package]]
+name = "bytemuck"
+version = "1.25.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c8efb64bd706a16a1bdde310ae86b351e4d21550d98d056f22f8a7f7a2183fec"
+
 [[package]]
 name = "byteorder"
 version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 
+[[package]]
+name = "byteorder-lite"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f1fe948ff07f4bd06c30984e69f5b4899c516a3ef74f34df92a2df2ab535495"
+
 [[package]]
 name = "bytes"
 version = "1.11.1"
@@ -306,6 +336,12 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c8d4a3bb8b1e0c1050499d1815f5ab16d04f0959b233085fb31653fbfc9d98f9"
 
+[[package]]
+name = "color_quant"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3d7b894f5411737b7867f4827955924d7c254fc9f4d91a6aad6b097804b1018b"
+
 [[package]]
 name = "colorchoice"
 version = "1.0.5"
@@ -350,6 +386,15 @@ version = "0.8.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
 
+[[package]]
+name = "core_maths"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77745e017f5edba1a9c1d854f6f3a52dac8a12dd5af5d2f54aecf61e43d80d30"
+dependencies = [
+ "libm",
+]
+
 [[package]]
 name = "cpufeatures"
 version = "0.2.17"
@@ -408,6 +453,12 @@ dependencies = [
  "typenum",
 ]
 
+[[package]]
+name = "data-url"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "be1e0bca6c3637f992fc1cc7cbc52a78c1ef6db076dbf1059c4323d6a2048376"
+
 [[package]]
 name = "der"
 version = "0.7.10"
@@ -484,6 +535,15 @@ dependencies = [
  "windows-sys 0.48.0",
 ]
 
+[[package]]
+name = "euclid"
+version = "0.22.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1a05365e3b1c6d1650318537c7460c6923f1abdd272ad6842baa2b509957a06"
+dependencies = [
+ "num-traits",
+]
+
 [[package]]
 name = "event-listener"
 version = "5.4.1"
@@ -495,6 +555,15 @@ dependencies = [
  "pin-project-lite",
 ]
 
+[[package]]
+name = "fdeflate"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e6853b52649d4ac5c0bd02320cddc5ba956bdb407c4b75a2c6b75bf51500f8c"
+dependencies = [
+ "simd-adler32",
+]
+
 [[package]]
 name = "find-msvc-tools"
 version = "0.1.9"
@@ -511,6 +580,12 @@ dependencies = [
  "miniz_oxide",
 ]
 
+[[package]]
+name = "float-cmp"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "98de4bbd547a563b716d8dfa9aad1cb19bfab00f4fa09a6a4ed21dbcf44ce9c4"
+
 [[package]]
 name = "flume"
 version = "0.11.1"
@@ -528,6 +603,29 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d9c4f5dac5e15c24eb999c26181a6ca40b39fe946cbe4c263c7209467bc83af2"
 
+[[package]]
+name = "fontconfig-parser"
+version = "0.5.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbc773e24e02d4ddd8395fd30dc147524273a83e54e0f312d986ea30de5f5646"
+dependencies = [
+ "roxmltree",
+]
+
+[[package]]
+name = "fontdb"
+version = "0.23.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "457e789b3d1202543297a350643cf459f836cade38934e7a4cf6a39e7cde2905"
+dependencies = [
+ "fontconfig-parser",
+ "log",
+ "memmap2",
+ "slotmap",
+ "tinyvec",
+ "ttf-parser",
+]
+
 [[package]]
 name = "form_urlencoded"
 version = "1.2.2"
@@ -645,6 +743,16 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "gif"
+version = "0.13.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ae047235e33e2829703574b54fdec96bfbad892062d97fed2f76022287de61b"
+dependencies = [
+ "color_quant",
+ "weezl",
+]
+
 [[package]]
 name = "hashbrown"
 version = "0.15.5"
@@ -941,6 +1049,22 @@ dependencies = [
  "icu_properties",
 ]
 
+[[package]]
+name = "image-webp"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "525e9ff3e1a4be2fbea1fdf0e98686a6d98b4d8f937e1bf7402245af1909e8c3"
+dependencies = [
+ "byteorder-lite",
+ "quick-error",
+]
+
+[[package]]
+name = "imagesize"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "edcd27d72f2f071c64249075f42e205ff93c9a4c5f6c6da53e79ed9f9832c285"
+
 [[package]]
 name = "indexmap"
 version = "2.14.0"
@@ -991,6 +1115,17 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "kurbo"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c62026ae44756f8a599ba21140f350303d4f08dcdcc71b5ad9c9bb8128c13c62"
+dependencies = [
+ "arrayvec",
+ "euclid",
+ "smallvec",
+]
+
 [[package]]
 name = "lazy_static"
 version = "1.5.0"
@@ -1018,7 +1153,7 @@ version = "0.1.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e02f3bb43d335493c96bf3fd3a321600bf6bd07ed34bc64118e9293bdffea46c"
 dependencies = [
- "bitflags",
+ "bitflags 2.11.1",
  "libc",
  "plain",
  "redox_syscall 0.7.4",
@@ -1092,6 +1227,15 @@ version = "2.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f8ca58f447f06ed17d5fc4043ce1b10dd205e060fb3ce5b979b8ed8e59ff3f79"
 
+[[package]]
+name = "memmap2"
+version = "0.9.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "714098028fe011992e1c3962653c96b2d578c4b4bce9036e15ff220319b1e0e3"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "mime"
 version = "0.3.17"
@@ -1131,6 +1275,7 @@ dependencies = [
  "moments-data",
  "moments-entities",
  "reqwest",
+ "resvg",
  "serde",
  "serde_json",
  "tokio",
@@ -1308,6 +1453,12 @@ version = "2.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b4f627cb1b25917193a259e49bdad08f671f8d9708acfd5fe0a8c1455d87220"
 
+[[package]]
+name = "pico-args"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5be167a7af36ee22fe3115051bc51f6e6c7054c9348e28deb4f49bd6f705a315"
+
 [[package]]
 name = "pin-project-lite"
 version = "0.2.17"
@@ -1347,6 +1498,19 @@ version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b4596b6d070b27117e987119b4dac604f3c58cfb0b191112e24771b2faeac1a6"
 
+[[package]]
+name = "png"
+version = "0.17.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "82151a2fc869e011c153adc57cf2789ccb8d9906ce52c0b39a6b5697749d7526"
+dependencies = [
+ "bitflags 1.3.2",
+ "crc32fast",
+ "fdeflate",
+ "flate2",
+ "miniz_oxide",
+]
+
 [[package]]
 name = "potential_utf"
 version = "0.1.5"
@@ -1374,6 +1538,12 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "quick-error"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a993555f31e5a609f617c12db6250dedcac1b0a85076912c436e6fc9b2c8e6a3"
+
 [[package]]
 name = "quinn"
 version = "0.11.9"
@@ -1509,7 +1679,7 @@ version = "0.5.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ed2bf2547551a7053d6fdfafda3f938979645c44812fbfcda098faae3f1a362d"
 dependencies = [
- "bitflags",
+ "bitflags 2.11.1",
 ]
 
 [[package]]
@@ -1518,7 +1688,7 @@ version = "0.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f450ad9c3b1da563fb6948a8e0fb0fb9269711c9c73d9ea1de5058c79c8d643a"
 dependencies = [
- "bitflags",
+ "bitflags 2.11.1",
 ]
 
 [[package]]
@@ -1576,6 +1746,32 @@ dependencies = [
  "webpki-roots 1.0.7",
 ]
 
+[[package]]
+name = "resvg"
+version = "0.45.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a8928798c0a55e03c9ca6c4c6846f76377427d2c1e1f7e6de3c06ae57942df43"
+dependencies = [
+ "gif",
+ "image-webp",
+ "log",
+ "pico-args",
+ "rgb",
+ "svgtypes",
+ "tiny-skia",
+ "usvg",
+ "zune-jpeg",
+]
+
+[[package]]
+name = "rgb"
+version = "0.8.53"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "47b34b781b31e5d73e9fbc8689c70551fd1ade9a19e3e28cfec8580a79290cc4"
+dependencies = [
+ "bytemuck",
+]
+
 [[package]]
 name = "ring"
 version = "0.17.14"
@@ -1590,6 +1786,12 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "roxmltree"
+version = "0.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c20b6793b5c2fa6553b250154b78d6d0db37e72700ae35fad9387a46f487c97"
+
 [[package]]
 name = "rsa"
 version = "0.9.10"
@@ -1657,6 +1859,24 @@ version = "1.0.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b39cdef0fa800fc44525c84ccb54a029961a8215f9619753635a9c0d2538d46d"
 
+[[package]]
+name = "rustybuzz"
+version = "0.20.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fd3c7c96f8a08ee34eff8857b11b49b07d71d1c3f4e88f8a88d4c9e9f90b1702"
+dependencies = [
+ "bitflags 2.11.1",
+ "bytemuck",
+ "core_maths",
+ "log",
+ "smallvec",
+ "ttf-parser",
+ "unicode-bidi-mirroring",
+ "unicode-ccc",
+ "unicode-properties",
+ "unicode-script",
+]
+
 [[package]]
 name = "ryu"
 version = "1.0.23"
@@ -1798,12 +2018,36 @@ version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "703d5c7ef118737c72f1af64ad2f6f8c5e1921f818cdcb97b8fe6fc69bf66214"
 
+[[package]]
+name = "simplecss"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a9c6883ca9c3c7c90e888de77b7a5c849c779d25d74a1269b0218b14e8b136c"
+dependencies = [
+ "log",
+]
+
+[[package]]
+name = "siphasher"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ee5873ec9cce0195efcb7a4e9507a04cd49aec9c83d0389df45b1ef7ba2e649"
+
 [[package]]
 name = "slab"
 version = "0.4.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0c790de23124f9ab44544d7ac05d60440adc586479ce501c1d6d7da3cd8c9cf5"
 
+[[package]]
+name = "slotmap"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bdd58c3c93c3d278ca835519292445cb4b0d4dc59ccfdf7ceadaab3f8aeb4038"
+dependencies = [
+ "version_check",
+]
+
 [[package]]
 name = "smallvec"
 version = "1.15.1"
@@ -1938,7 +2182,7 @@ checksum = "aa003f0038df784eb8fecbbac13affe3da23b45194bd57dba231c8f48199c526"
 dependencies = [
  "atoi",
  "base64",
- "bitflags",
+ "bitflags 2.11.1",
  "byteorder",
  "bytes",
  "chrono",
@@ -1981,7 +2225,7 @@ checksum = "db58fcd5a53cf07c184b154801ff91347e4c30d17a3562a635ff028ad5deda46"
 dependencies = [
  "atoi",
  "base64",
- "bitflags",
+ "bitflags 2.11.1",
  "byteorder",
  "chrono",
  "crc",
@@ -2042,6 +2286,15 @@ version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6ce2be8dc25455e1f91df71bfa12ad37d7af1092ae736f3a6cd0e37bc7810596"
 
+[[package]]
+name = "strict-num"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6637bab7722d379c8b41ba849228d680cc12d0a45ba1fa2b48f2a30577a06731"
+dependencies = [
+ "float-cmp",
+]
+
 [[package]]
 name = "stringprep"
 version = "0.1.5"
@@ -2065,6 +2318,16 @@ version = "2.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "13c2bddecc57b384dee18652358fb23172facb8a2c51ccc10d74c157bdea3292"
 
+[[package]]
+name = "svgtypes"
+version = "0.15.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68c7541fff44b35860c1a7a47a7cadf3e4a304c457b58f9870d9706ece028afc"
+dependencies = [
+ "kurbo",
+ "siphasher",
+]
+
 [[package]]
 name = "syn"
 version = "2.0.117"
@@ -2125,6 +2388,32 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "tiny-skia"
+version = "0.11.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83d13394d44dae3207b52a326c0c85a8bf87f1541f23b0d143811088497b09ab"
+dependencies = [
+ "arrayref",
+ "arrayvec",
+ "bytemuck",
+ "cfg-if",
+ "log",
+ "png",
+ "tiny-skia-path",
+]
+
+[[package]]
+name = "tiny-skia-path"
+version = "0.11.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c9e7fc0c2e86a30b117d0462aa261b72b7a99b7ebd7deb3a14ceda95c5bdc93"
+dependencies = [
+ "arrayref",
+ "bytemuck",
+ "strict-num",
+]
+
 [[package]]
 name = "tinystr"
 version = "0.8.3"
@@ -2234,7 +2523,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d4e6559d53cc268e5031cd8429d05415bc4cb4aefc4aa5d6cc35fbf5b924a1f8"
 dependencies = [
  "async-compression",
- "bitflags",
+ "bitflags 2.11.1",
  "bytes",
  "futures-core",
  "futures-util",
@@ -2344,6 +2633,15 @@ version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e421abadd41a4225275504ea4d6566923418b7f05506fbc9c0fe86ba7396114b"
 
+[[package]]
+name = "ttf-parser"
+version = "0.25.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2df906b07856748fa3f6e0ad0cbaa047052d4a7dd609e231c4f72cee8c36f31"
+dependencies = [
+ "core_maths",
+]
+
 [[package]]
 name = "typenum"
 version = "1.20.0"
@@ -2356,6 +2654,18 @@ version = "0.3.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5c1cb5db39152898a79168971543b1cb5020dff7fe43c8dc468b0885f5e29df5"
 
+[[package]]
+name = "unicode-bidi-mirroring"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5dfa6e8c60bb66d49db113e0125ee8711b7647b5579dc7f5f19c42357ed039fe"
+
+[[package]]
+name = "unicode-ccc"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce61d488bcdc9bc8b5d1772c404828b17fc481c0a582b5581e95fb233aef503e"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.24"
@@ -2377,6 +2687,18 @@ version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7df058c713841ad818f1dc5d3fd88063241cc61f49f5fbea4b951e8cf5a8d71d"
 
+[[package]]
+name = "unicode-script"
+version = "0.5.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "383ad40bb927465ec0ce7720e033cb4ca06912855fc35db31b5755d0de75b1ee"
+
+[[package]]
+name = "unicode-vo"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b1d386ff53b415b7fe27b50bb44679e2cc4660272694b7b6f3326d8480823a94"
+
 [[package]]
 name = "untrusted"
 version = "0.9.0"
@@ -2395,6 +2717,33 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "usvg"
+version = "0.45.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "80be9b06fbae3b8b303400ab20778c80bbaf338f563afe567cf3c9eea17b47ef"
+dependencies = [
+ "base64",
+ "data-url",
+ "flate2",
+ "fontdb",
+ "imagesize",
+ "kurbo",
+ "log",
+ "pico-args",
+ "roxmltree",
+ "rustybuzz",
+ "simplecss",
+ "siphasher",
+ "strict-num",
+ "svgtypes",
+ "tiny-skia-path",
+ "unicode-bidi",
+ "unicode-script",
+ "unicode-vo",
+ "xmlwriter",
+]
+
 [[package]]
 name = "utf8_iter"
 version = "1.0.4"
@@ -2548,6 +2897,12 @@ dependencies = [
  "rustls-pki-types",
 ]
 
+[[package]]
+name = "weezl"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a28ac98ddc8b9274cb41bb4d9d4d5c425b6020c50c46f25559911905610b4a88"
+
 [[package]]
 name = "whoami"
 version = "1.6.1"
@@ -2860,6 +3215,12 @@ version = "0.6.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1ffae5123b2d3fc086436f8834ae3ab053a283cfac8fe0a0b8eaae044768a4c4"
 
+[[package]]
+name = "xmlwriter"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec7a2a501ed189703dba8b08142f057e887dfc4b2cc4db2d343ac6376ba3e0b9"
+
 [[package]]
 name = "yoke"
 version = "0.8.2"
@@ -2968,3 +3329,18 @@ name = "zmij"
 version = "1.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b8848ee67ecc8aedbaf3e4122217aff892639231befc6a1b58d29fff4c2cabaa"
+
+[[package]]
+name = "zune-core"
+version = "0.4.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f423a2c17029964870cfaabb1f13dfab7d092a62a29a89264f4d36990ca414a"
+
+[[package]]
+name = "zune-jpeg"
+version = "0.4.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29ce2c8a9384ad323cf564b67da86e21d3cfdff87908bc1223ed5c99bc792713"
+dependencies = [
+ "zune-core",
+]

Cargo.toml

@@ -30,6 +30,7 @@ anyhow = "1"
 reqwest = { version = "0.12", default-features = false, features = ["rustls-tls", "json", "gzip"] }
 figment = { version = "0.10", features = ["toml", "env"] }
 clap = { version = "4", features = ["derive", "env"] }
+resvg = "0.45"
 
 # internal
 moments-entities = { path = "crates/moments-entities", version = "=0.1.0" }

crates/moments-api/Cargo.toml

@@ -21,3 +21,4 @@ serde_json.workspace = true
 chrono.workspace = true
 clap.workspace = true
 reqwest.workspace = true
+resvg.workspace = true

crates/moments-api/src/main.rs

@@ -7,7 +7,7 @@ use axum::{
     response::IntoResponse,
     routing::get,
 };
-use chrono::{DateTime, NaiveDate, Utc};
+use chrono::{DateTime, Datelike, NaiveDate, Utc};
 use clap::Parser;
 use moments_core::{EventReader, reshape};
 use moments_data::PgStore;
@@ -58,6 +58,7 @@ async fn main() -> anyhow::Result<()> {
         .route("/v1/projects", get(list_projects))
         .route("/v1/activity/daily", get(daily_counts))
         .route("/v1/forge/{source}/{*rest}", get(forge_proxy))
+        .route("/v1/og/contributions.png", get(og_contributions))
         .with_state(state)
         .layer(TraceLayer::new_for_http())
         .layer(CorsLayer::permissive());
@@ -156,6 +157,172 @@ async fn daily_counts(
     Ok(Json(counts))
 }
 
+async fn og_contributions(
+    State(state): State<AppState>,
+) -> Result<impl IntoResponse, ApiError> {
+    // Get date range from source summaries
+    let summaries = state
+        .store
+        .source_summaries(false)
+        .await
+        .map_err(internal)?;
+    let earliest = summaries
+        .iter()
+        .filter_map(|s| s.earliest)
+        .min()
+        .unwrap_or_else(|| Utc::now())
+        .date_naive();
+    let today = Utc::now().date_naive();
+
+    let counts = state
+        .store
+        .daily_counts(earliest, today)
+        .await
+        .map_err(internal)?;
+
+    let png = render_contributions_png(&counts, earliest, today).map_err(|e| ApiError {
+        status: StatusCode::INTERNAL_SERVER_ERROR,
+        message: e,
+    })?;
+
+    Ok((
+        StatusCode::OK,
+        [
+            (axum::http::header::CONTENT_TYPE, "image/png"),
+            (axum::http::header::CACHE_CONTROL, "public, max-age=3600"),
+        ],
+        png,
+    ))
+}
+
+fn render_contributions_png(
+    counts: &[DailyCount],
+    from: NaiveDate,
+    to: NaiveDate,
+) -> Result<Vec<u8>, String> {
+    use std::collections::HashMap;
+
+    let count_map: HashMap<NaiveDate, i64> = counts.iter().map(|d| (d.date, d.count)).collect();
+
+    let cell = 10_f64;
+    let gap = 2_f64;
+    let step = cell + gap;
+    let radius = cell / 2.0;
+    let year_label_w = 40_f64;
+    let max_cols = 53;
+    let bg = "#2c3e50";
+
+    let colors = ["rgba(255,255,255,0.05)", "#0e4429", "#006d32", "#26a641", "#39d353"];
+
+    // Build weekly data per year
+    struct YearRow {
+        year: i32,
+        weeks: Vec<(NaiveDate, NaiveDate, i64)>, // start, end, count
+    }
+    let start_year = from.year();
+    let end_year = to.year();
+    let mut rows: Vec<YearRow> = Vec::new();
+
+    for yr in start_year..=end_year {
+        let year_start = NaiveDate::from_ymd_opt(yr, 1, 1).unwrap();
+        let year_end = if yr == end_year {
+            to
+        } else {
+            NaiveDate::from_ymd_opt(yr, 12, 31).unwrap()
+        };
+        // Align to preceding Sunday (weekday 6 = Sunday in chrono's Mon=0 scheme)
+        let offset = year_start.weekday().num_days_from_sunday();
+        let mut cursor = year_start - chrono::Duration::days(offset as i64);
+
+        let mut weeks = Vec::new();
+        while cursor <= year_end {
+            let week_start = cursor;
+            let mut week_count = 0i64;
+            for _ in 0..7 {
+                week_count += count_map.get(&cursor).copied().unwrap_or(0);
+                cursor += chrono::Duration::days(1);
+            }
+            let week_end = cursor - chrono::Duration::days(1);
+            weeks.push((week_start, week_end, week_count));
+        }
+        rows.push(YearRow { year: yr, weeks });
+    }
+
+    // Quantile thresholds
+    let mut non_zero: Vec<i64> = rows
+        .iter()
+        .flat_map(|r| r.weeks.iter().map(|w| w.2))
+        .filter(|&c| c > 0)
+        .collect();
+    non_zero.sort();
+    let thresholds = if non_zero.is_empty() {
+        [1i64, 2, 3]
+    } else {
+        let p = |pct: f64| non_zero[(pct * non_zero.len() as f64).min(non_zero.len() as f64 - 1.0) as usize];
+        [p(0.25), p(0.5), p(0.75)]
+    };
+
+    let color_for = |count: i64| -> &str {
+        if count == 0 { colors[0] }
+        else if count <= thresholds[0] { colors[1] }
+        else if count <= thresholds[1] { colors[2] }
+        else if count <= thresholds[2] { colors[3] }
+        else { colors[4] }
+    };
+
+    let n_rows = rows.len();
+    let title_h = 28_f64;
+    let svg_w = year_label_w + (max_cols as f64) * step;
+    let svg_h = title_h + (n_rows as f64) * step + 8.0;
+
+    let total: i64 = counts.iter().map(|d| d.count).sum();
+
+    let mut svg = format!(
+        r#"<svg xmlns="http://www.w3.org/2000/svg" width="{svg_w}" height="{svg_h}" viewBox="0 0 {svg_w} {svg_h}"><rect width="100%" height="100%" fill="{bg}"/>"#,
+    );
+    svg.push_str(&format!(
+        r##"<text x="{x}" y="18" fill="#ecf0f1" font-size="12" opacity="0.6">{total} contributions since {from}</text>"##,
+        x = year_label_w,
+    ));
+
+    for (row_idx, row) in rows.iter().enumerate() {
+        let y_base = title_h + (row_idx as f64) * step;
+        svg.push_str(&format!(
+            r##"<text x="{x}" y="{y}" text-anchor="end" dominant-baseline="central" fill="#ecf0f1" font-size="9" opacity="0.6">{yr}</text>"##,
+            x = year_label_w - 4.0,
+            y = y_base + radius,
+            yr = row.year,
+        ));
+        for (col, (_, _, count)) in row.weeks.iter().enumerate() {
+            let cx = year_label_w + (col as f64) * step + radius;
+            let cy = y_base + radius;
+            let fill = color_for(*count);
+            svg.push_str(&format!(
+                r#"<circle cx="{cx}" cy="{cy}" r="{r}" fill="{fill}"/>"#,
+                r = radius - 1.0,
+            ));
+        }
+    }
+
+    svg.push_str("</svg>");
+
+    // Rasterize with resvg
+    let tree = resvg::usvg::Tree::from_str(&svg, &resvg::usvg::Options::default())
+        .map_err(|e| format!("svg parse: {e}"))?;
+
+    let size = tree.size();
+    let w = size.width().ceil() as u32;
+    let h = size.height().ceil() as u32;
+    let mut pixmap =
+        resvg::tiny_skia::Pixmap::new(w, h).ok_or_else(|| "pixmap alloc failed".to_string())?;
+
+    resvg::render(&tree, resvg::tiny_skia::Transform::default(), &mut pixmap.as_mut());
+
+    pixmap
+        .encode_png()
+        .map_err(|e| format!("png encode: {e}"))
+}
+
 /// Allowlisted forge hosts that the proxy may contact.
 const ALLOWED_HOSTS: &[&str] = &["api.github.com", "git.lair.cafe"];
 

ui/index.html

@@ -4,6 +4,12 @@
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>rob.tn</title>
+    <meta property="og:title" content="rob thijssen" />
+    <meta property="og:description" content="contribution history across github, gitea, and mozilla hg" />
+    <meta property="og:image" content="https://rob.tn/api/v1/og/contributions.png" />
+    <meta property="og:type" content="website" />
+    <meta name="twitter:card" content="summary_large_image" />
+    <meta name="twitter:image" content="https://rob.tn/api/v1/og/contributions.png" />
     <link rel="icon" type="image/x-icon" href="/favicon.ico" />
     <link rel="icon" type="image/png" sizes="16x16" href="/favicon-16.png" />
     <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32.png" />