diff --git a/.github/workflows/fly.yml b/.github/workflows/fly.yml new file mode 100644 index 00000000..c2524e2e --- /dev/null +++ b/.github/workflows/fly.yml @@ -0,0 +1,19 @@ +name: Deploy web proxy to Fly.io + +on: + push: + branches: [main] + paths: + - 'services/web-proxy' + +env: + FLY_API_TOKEN: ${{ secrets.FLY_API_TOKEN }} + +jobs: + deploy: + name: Deploy app + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v2 + - uses: superfly/flyctl-actions/setup-flyctl@master + - run: (cd services/web-proxy && flyctl deploy) diff --git a/services/web-proxy/Dockerfile b/services/web-proxy/Dockerfile new file mode 100644 index 00000000..d32c0ccc --- /dev/null +++ b/services/web-proxy/Dockerfile @@ -0,0 +1,14 @@ +FROM alpine:latest as builder + +RUN apk add go + +WORKDIR /build +COPY . /build/ + +RUN go build . + +FROM alpine:latest + +COPY --from=builder /build/web-proxy /bin/web-proxy + +ENTRYPOINT [ "/bin/web-proxy" ] \ No newline at end of file diff --git a/services/web-proxy/fly.toml b/services/web-proxy/fly.toml new file mode 100644 index 00000000..4bb975d7 --- /dev/null +++ b/services/web-proxy/fly.toml @@ -0,0 +1,28 @@ +app = "pluralkit" +kill_signal = "SIGTERM" +kill_timeout = 5 + +[metrics] + port = 9091 + path = "/metrics" + +[deploy] + strategy = "bluegreen" + +[[services]] + internal_port = 8080 + protocol = "tcp" + + [services.concurrency] + hard_limit = 500 + soft_limit = 400 + type = "connections" + + [[services.ports]] + force_https = true + handlers = ["http"] + port = 80 + + [[services.ports]] + handlers = ["tls", "http"] + port = 443 \ No newline at end of file diff --git a/services/web-proxy/go.mod b/services/web-proxy/go.mod new file mode 100644 index 00000000..21c71807 --- /dev/null +++ b/services/web-proxy/go.mod @@ -0,0 +1,18 @@ +module web-proxy + +go 1.19 + +require ( + github.com/beorn7/perks v1.0.1 // indirect + github.com/cespare/xxhash/v2 v2.1.2 // indirect + github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect + github.com/go-redis/redis/v8 v8.11.5 // indirect + github.com/golang/protobuf v1.5.2 // indirect + github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect + github.com/prometheus/client_golang v1.14.0 // indirect + github.com/prometheus/client_model v0.3.0 // indirect + github.com/prometheus/common v0.37.0 // indirect + github.com/prometheus/procfs v0.8.0 // indirect + golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a // indirect + google.golang.org/protobuf v1.28.1 // indirect +) diff --git a/services/web-proxy/go.sum b/services/web-proxy/go.sum new file mode 100644 index 00000000..c98da1c2 --- /dev/null +++ b/services/web-proxy/go.sum @@ -0,0 +1,482 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= +cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= +cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc= +cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0= +cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To= +cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4= +cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M= +cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc= +cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk= +cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs= +cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc= +cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY= 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h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg= +honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k= +honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k= +rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8= +rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0= +rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA= diff --git a/services/web-proxy/main.go b/services/web-proxy/main.go new file mode 100644 index 00000000..506989f1 --- /dev/null +++ b/services/web-proxy/main.go @@ -0,0 +1,127 @@ +package main + +import ( + "context" + "log" + "net/http" + "net/http/httputil" + "strconv" + "strings" + "time" + + "github.com/go-redis/redis/v8" + "github.com/prometheus/client_golang/prometheus" + "github.com/prometheus/client_golang/prometheus/promhttp" + + "web-proxy/redis_rate" +) + +var limiter *redis_rate.Limiter + +// todo: be able to raise ratelimits for >1 consumers +var token2 string + +var remotes = map[string]*httputil.ReverseProxy{ + "api.pluralkit.me": proxyTo("[fdaa:0:ae33:a7b:8dd7:0:a:2]:8080"), + "dash.pluralkit.me": proxyTo("[fdaa:0:ae33:a7b:8dd7:0:a:2]:8080"), + "sentry.pluralkit.me": proxyTo("[fdaa:0:ae33:a7b:8dd7:0:a:202]:9000"), + "plausible.pluralkit.me": proxyTo("[fdaa:0:ae33:a7b:8dd7:0:a:202]:8000"), +} + +func init() { + redisHost := requireEnv("REDIS_HOST") + redisPassword := requireEnv("REDIS_PASSWORD") + + rdb := redis.NewClient(&redis.Options{ + Addr: redisHost, + Username: "default", + Password: redisPassword, + }) + limiter = redis_rate.NewLimiter(rdb) + + token2 = requireEnv("TOKEN2") + + remotes["dash.pluralkit.me"].ModifyResponse = modifyDashResponse +} + +type ProxyHandler struct{} + +func (p ProxyHandler) ServeHTTP(rw http.ResponseWriter, r *http.Request) { + remote, ok := remotes[r.Host] + if !ok { + // unknown domains redirect to landing page + http.Redirect(rw, r, "https://pluralkit.me", http.StatusFound) + return + } + + if r.Host == "api.pluralkit.me" { + // root + if r.URL.Path == "" { + // api root path redirects to docs + http.Redirect(rw, r, "https://pluralkit.me/api/", http.StatusFound) + return + } + + // CORS headers + rw.Header().Add("Access-Control-Allow-Origin", "*") + rw.Header().Add("Access-Control-Request-Method", r.Method) + rw.Header().Add("Access-Control-Allow-Credentials", "true") + rw.Header().Add("Access-Control-Allow-Headers", "Content-Type, Authorization, sentry-trace") + rw.Header().Add("Access-Control-Max-Age", "86400") + + if r.Method == http.MethodOptions { + rw.WriteHeader(200) + return + } + + if is_api_ratelimited(rw, r) { + return + } + } + + startTime := time.Now() + r = r.WithContext(context.WithValue(r.Context(), "req-time", startTime)) + + remote.ServeHTTP(rw, r) +} + +func logTimeElapsed(resp *http.Response) error { + r := resp.Request + + startTime := r.Context().Value("req-time").(time.Time) + + elapsed := time.Since(startTime) + metric.With(map[string]string{ + "domain": r.Host, + "method": r.Method, + "status": strconv.Itoa(resp.StatusCode), + "route": cleanPath(r.Host, r.URL.Path), + }).Observe(elapsed.Seconds()) + + log.Printf("[%s %s] \"%s %s%s\" %d - %vms\n", r.Header.Get("Fly-Client-IP"), r.Header.Get("User-Agent"), r.Method, r.Host, r.URL.Path, resp.StatusCode, elapsed.Milliseconds()) + + return nil +} + +func modifyDashResponse(resp *http.Response) error { + r := resp.Request + + // cache built+hashed dashboard js/css files forever + is_dash_static_asset := strings.HasPrefix(r.URL.Path, "/assets/") && + (strings.HasSuffix(r.URL.Path, ".js") || strings.HasSuffix(r.URL.Path, ".css") || strings.HasSuffix(r.URL.Path, ".map")) + + if is_dash_static_asset && resp.StatusCode == 200 { + resp.Header.Add("Cache-Control", "max-age: 604800") + } + + return logTimeElapsed(resp) +} + +func main() { + prometheus.MustRegister(metric) + + http.Handle("/metrics", promhttp.Handler()) + go http.ListenAndServe(":9091", nil) + + http.ListenAndServe(":8080", ProxyHandler{}) +} diff --git a/services/web-proxy/rate_limit.go b/services/web-proxy/rate_limit.go new file mode 100644 index 00000000..3d32119d --- /dev/null +++ b/services/web-proxy/rate_limit.go @@ -0,0 +1,43 @@ +package main + +import ( + "fmt" + "net/http" + "time" + + "web-proxy/redis_rate" +) + +func is_api_ratelimited(rw http.ResponseWriter, r *http.Request) bool { + var limit int + var key string + + if r.Header.Get("X-PluralKit-App") == token2 { + limit = 20 + key = "token2" + } else { + limit = 2 + key = r.Header.Get("Fly-Client-IP") + } + + res, err := limiter.Allow(r.Context(), "ratelimit:"+key, redis_rate.Limit{ + Period: time.Second, + Rate: limit, + Burst: 5, + }) + if err != nil { + panic(err) + } + + rw.Header().Set("X-RateLimit-Limit", fmt.Sprint(limit)) + rw.Header().Set("X-RateLimit-Remaining", fmt.Sprint(res.Remaining)) + rw.Header().Set("X-RateLimit-Reset", fmt.Sprint(time.Now().Add(res.ResetAfter).UnixNano()/1_000_000)) + + if res.Allowed < 1 { + rw.WriteHeader(429) + rw.Write([]byte(`{"message":"429: too many requests","retry_after":` + fmt.Sprint(res.RetryAfter.Milliseconds()) + `,"code":0}`)) + return true + } + + return false +} diff --git a/services/web-proxy/redis_rate/LICENSE b/services/web-proxy/redis_rate/LICENSE new file mode 100644 index 00000000..aaf73aa9 --- /dev/null +++ b/services/web-proxy/redis_rate/LICENSE @@ -0,0 +1,25 @@ +Copyright (c) 2013 The github.com/go-redis/redis_rate Authors. +All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are +met: + + * Redistributions of source code must retain the above copyright +notice, this list of conditions and the following disclaimer. + * 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. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 COPYRIGHT +OWNER 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. diff --git a/services/web-proxy/redis_rate/lua.go b/services/web-proxy/redis_rate/lua.go new file mode 100644 index 00000000..cab02ca3 --- /dev/null +++ b/services/web-proxy/redis_rate/lua.go @@ -0,0 +1,140 @@ +package redis_rate + +import "github.com/go-redis/redis/v8" + +// pluralkit changes: +// fly's hosted redis doesn't support replicate commands +// we can remove it since it's a single host + +// Copyright (c) 2017 Pavel Pravosud +// https://github.com/rwz/redis-gcra/blob/master/vendor/perform_gcra_ratelimit.lua +var allowN = redis.NewScript(` +-- this script has side-effects, so it requires replicate commands mode +-- redis.replicate_commands() + +local rate_limit_key = KEYS[1] +local burst = ARGV[1] +local rate = ARGV[2] +local period = ARGV[3] +local cost = tonumber(ARGV[4]) + +local emission_interval = period / rate +local increment = emission_interval * cost +local burst_offset = emission_interval * burst + +-- redis returns time as an array containing two integers: seconds of the epoch +-- time (10 digits) and microseconds (6 digits). for convenience we need to +-- convert them to a floating point number. the resulting number is 16 digits, +-- bordering on the limits of a 64-bit double-precision floating point number. +-- adjust the epoch to be relative to Jan 1, 2017 00:00:00 GMT to avoid floating +-- point problems. this approach is good until "now" is 2,483,228,799 (Wed, 09 +-- Sep 2048 01:46:39 GMT), when the adjusted value is 16 digits. +local jan_1_2017 = 1483228800 +local now = redis.call("TIME") +now = (now[1] - jan_1_2017) + (now[2] / 1000000) + +local tat = redis.call("GET", rate_limit_key) + +if not tat then + tat = now +else + tat = tonumber(tat) +end + +tat = math.max(tat, now) + +local new_tat = tat + increment +local allow_at = new_tat - burst_offset + +local diff = now - allow_at +local remaining = diff / emission_interval + +if remaining < 0 then + local reset_after = tat - now + local retry_after = diff * -1 + return { + 0, -- allowed + 0, -- remaining + tostring(retry_after), + tostring(reset_after), + } +end + +local reset_after = new_tat - now +if reset_after > 0 then + redis.call("SET", rate_limit_key, new_tat, "EX", math.ceil(reset_after)) +end +local retry_after = -1 +return {cost, remaining, tostring(retry_after), tostring(reset_after)} +`) + +var allowAtMost = redis.NewScript(` +-- this script has side-effects, so it requires replicate commands mode +-- redis.replicate_commands() + +local rate_limit_key = KEYS[1] +local burst = ARGV[1] +local rate = ARGV[2] +local period = ARGV[3] +local cost = tonumber(ARGV[4]) + +local emission_interval = period / rate +local burst_offset = emission_interval * burst + +-- redis returns time as an array containing two integers: seconds of the epoch +-- time (10 digits) and microseconds (6 digits). for convenience we need to +-- convert them to a floating point number. the resulting number is 16 digits, +-- bordering on the limits of a 64-bit double-precision floating point number. +-- adjust the epoch to be relative to Jan 1, 2017 00:00:00 GMT to avoid floating +-- point problems. this approach is good until "now" is 2,483,228,799 (Wed, 09 +-- Sep 2048 01:46:39 GMT), when the adjusted value is 16 digits. +local jan_1_2017 = 1483228800 +local now = redis.call("TIME") +now = (now[1] - jan_1_2017) + (now[2] / 1000000) + +local tat = redis.call("GET", rate_limit_key) + +if not tat then + tat = now +else + tat = tonumber(tat) +end + +tat = math.max(tat, now) + +local diff = now - (tat - burst_offset) +local remaining = diff / emission_interval + +if remaining < 1 then + local reset_after = tat - now + local retry_after = emission_interval - diff + return { + 0, -- allowed + 0, -- remaining + tostring(retry_after), + tostring(reset_after), + } +end + +if remaining < cost then + cost = remaining + remaining = 0 +else + remaining = remaining - cost +end + +local increment = emission_interval * cost +local new_tat = tat + increment + +local reset_after = new_tat - now +if reset_after > 0 then + redis.call("SET", rate_limit_key, new_tat, "EX", math.ceil(reset_after)) +end + +return { + cost, + remaining, + tostring(-1), + tostring(reset_after), +} +`) diff --git a/services/web-proxy/redis_rate/rate.go b/services/web-proxy/redis_rate/rate.go new file mode 100644 index 00000000..058a8225 --- /dev/null +++ b/services/web-proxy/redis_rate/rate.go @@ -0,0 +1,198 @@ +package redis_rate + +import ( + "context" + "fmt" + "strconv" + "time" + + "github.com/go-redis/redis/v8" +) + +const redisPrefix = "rate:" + +type rediser interface { + Eval(ctx context.Context, script string, keys []string, args ...interface{}) *redis.Cmd + EvalSha(ctx context.Context, sha1 string, keys []string, args ...interface{}) *redis.Cmd + ScriptExists(ctx context.Context, hashes ...string) *redis.BoolSliceCmd + ScriptLoad(ctx context.Context, script string) *redis.StringCmd + Del(ctx context.Context, keys ...string) *redis.IntCmd +} + +type Limit struct { + Rate int + Burst int + Period time.Duration +} + +func (l Limit) String() string { + return fmt.Sprintf("%d req/%s (burst %d)", l.Rate, fmtDur(l.Period), l.Burst) +} + +func (l Limit) IsZero() bool { + return l == Limit{} +} + +func fmtDur(d time.Duration) string { + switch d { + case time.Second: + return "s" + case time.Minute: + return "m" + case time.Hour: + return "h" + } + return d.String() +} + +func PerSecond(rate int) Limit { + return Limit{ + Rate: rate, + Period: time.Second, + Burst: rate, + } +} + +func PerMinute(rate int) Limit { + return Limit{ + Rate: rate, + Period: time.Minute, + Burst: rate, + } +} + +func PerHour(rate int) Limit { + return Limit{ + Rate: rate, + Period: time.Hour, + Burst: rate, + } +} + +//------------------------------------------------------------------------------ + +// Limiter controls how frequently events are allowed to happen. +type Limiter struct { + rdb rediser +} + +// NewLimiter returns a new Limiter. +func NewLimiter(rdb rediser) *Limiter { + return &Limiter{ + rdb: rdb, + } +} + +// Allow is a shortcut for AllowN(ctx, key, limit, 1). +func (l Limiter) Allow(ctx context.Context, key string, limit Limit) (*Result, error) { + return l.AllowN(ctx, key, limit, 1) +} + +// AllowN reports whether n events may happen at time now. +func (l Limiter) AllowN( + ctx context.Context, + key string, + limit Limit, + n int, +) (*Result, error) { + values := []interface{}{limit.Burst, limit.Rate, limit.Period.Seconds(), n} + v, err := allowN.Run(ctx, l.rdb, []string{redisPrefix + key}, values...).Result() + if err != nil { + return nil, err + } + + values = v.([]interface{}) + + retryAfter, err := strconv.ParseFloat(values[2].(string), 64) + if err != nil { + return nil, err + } + + resetAfter, err := strconv.ParseFloat(values[3].(string), 64) + if err != nil { + return nil, err + } + + res := &Result{ + Limit: limit, + Allowed: int(values[0].(int64)), + Remaining: int(values[1].(int64)), + RetryAfter: dur(retryAfter), + ResetAfter: dur(resetAfter), + } + return res, nil +} + +// AllowAtMost reports whether at most n events may happen at time now. +// It returns number of allowed events that is less than or equal to n. +func (l Limiter) AllowAtMost( + ctx context.Context, + key string, + limit Limit, + n int, +) (*Result, error) { + values := []interface{}{limit.Burst, limit.Rate, limit.Period.Seconds(), n} + v, err := allowAtMost.Run(ctx, l.rdb, []string{redisPrefix + key}, values...).Result() + if err != nil { + return nil, err + } + + values = v.([]interface{}) + + retryAfter, err := strconv.ParseFloat(values[2].(string), 64) + if err != nil { + return nil, err + } + + resetAfter, err := strconv.ParseFloat(values[3].(string), 64) + if err != nil { + return nil, err + } + + res := &Result{ + Limit: limit, + Allowed: int(values[0].(int64)), + Remaining: int(values[1].(int64)), + RetryAfter: dur(retryAfter), + ResetAfter: dur(resetAfter), + } + return res, nil +} + +// Reset gets a key and reset all limitations and previous usages +func (l *Limiter) Reset(ctx context.Context, key string) error { + return l.rdb.Del(ctx, redisPrefix+key).Err() +} + +func dur(f float64) time.Duration { + if f == -1 { + return -1 + } + return time.Duration(f * float64(time.Second)) +} + +type Result struct { + // Limit is the limit that was used to obtain this result. + Limit Limit + + // Allowed is the number of events that may happen at time now. + Allowed int + + // Remaining is the maximum number of requests that could be + // permitted instantaneously for this key given the current + // state. For example, if a rate limiter allows 10 requests per + // second and has already received 6 requests for this key this + // second, Remaining would be 4. + Remaining int + + // RetryAfter is the time until the next request will be permitted. + // It should be -1 unless the rate limit has been exceeded. + RetryAfter time.Duration + + // ResetAfter is the time until the RateLimiter returns to its + // initial state for a given key. For example, if a rate limiter + // manages requests per second and received one request 200ms ago, + // Reset would return 800ms. You can also think of this as the time + // until Limit and Remaining will be equal. + ResetAfter time.Duration +} diff --git a/services/web-proxy/util.go b/services/web-proxy/util.go new file mode 100644 index 00000000..1304eb0d --- /dev/null +++ b/services/web-proxy/util.go @@ -0,0 +1,63 @@ +package main + +import ( + "net/http/httputil" + "net/url" + "os" + "regexp" + "strings" + + "github.com/prometheus/client_golang/prometheus" +) + +var metric = prometheus.NewHistogramVec( + prometheus.HistogramOpts{ + Name: "pk_http_requests", + Buckets: []float64{.1, .25, 1, 2.5, 5, 20}, + }, + []string{"domain", "method", "status", "route"}, +) + +func proxyTo(host string) *httputil.ReverseProxy { + rp := httputil.NewSingleHostReverseProxy(&url.URL{ + Scheme: "http", + Host: host, + RawQuery: "", + }) + rp.ModifyResponse = logTimeElapsed + return rp +} + +var systemsRegex = regexp.MustCompile("systems/[^/]+") +var membersRegex = regexp.MustCompile("members/[^/]+") +var groupsRegex = regexp.MustCompile("groups/[^/]+") +var switchesRegex = regexp.MustCompile("switches/[^/]+") +var guildsRegex = regexp.MustCompile("guilds/[^/]+") +var messagesRegex = regexp.MustCompile("messages/[^/]+") + +func cleanPath(host, path string) string { + if host != "api.pluralkit.me" { + return "" + } + + if !(strings.HasPrefix(host, "/v2") || strings.HasPrefix(host, "/private")) { + return "" + } + + path = systemsRegex.ReplaceAllString(path, "{systemRef}") + path = membersRegex.ReplaceAllString(path, "{memberRef}") + path = groupsRegex.ReplaceAllString(path, "{groupRef}") + path = switchesRegex.ReplaceAllString(path, "{switchRef}") + path = guildsRegex.ReplaceAllString(path, "{guild_id}") + path = messagesRegex.ReplaceAllString(path, "{message_id}") + + return path +} + +func requireEnv(key string) string { + if val, ok := os.LookupEnv(key); !ok { + panic("missing `" + key + "` in environment") + } else { + return val + } +}