112 lines
3.0 KiB
Go
112 lines
3.0 KiB
Go
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/*
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GoToSocial
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Copyright (C) 2021-2023 GoToSocial Authors admin@gotosocial.org
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package middleware
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import (
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"bufio"
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"context"
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"crypto/rand"
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"encoding/base32"
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"encoding/binary"
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"io"
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"sync"
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"time"
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"codeberg.org/gruf/go-kv"
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"github.com/gin-gonic/gin"
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"github.com/superseriousbusiness/gotosocial/internal/log"
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)
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type ctxType string
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var (
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// ridCtxKey is the key underwhich we store request IDs in a context.
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ridCtxKey ctxType = "id"
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// crand provides buffered reads of random input.
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crand = bufio.NewReader(rand.Reader)
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mrand sync.Mutex
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// base32enc is a base 32 encoding based on a human-readable character set (no padding).
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base32enc = base32.NewEncoding("0123456789abcdefghjkmnpqrstvwxyz").WithPadding(-1)
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)
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// generateID generates a new ID string.
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func generateID() string {
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// 0:8 = timestamp
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// 8:12 = entropy
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//
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// inspired by ULID.
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b := make([]byte, 12)
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// Get current time in milliseconds.
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ms := uint64(time.Now().UnixMilli())
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// Store binary time data in byte buffer.
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binary.LittleEndian.PutUint64(b[0:8], ms)
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mrand.Lock()
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// Read random bits into buffer end.
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_, _ = io.ReadFull(crand, b[8:12])
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mrand.Unlock()
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// Encode the binary time+entropy ID.
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return base32enc.EncodeToString(b)
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}
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// RequestID fetches the stored request ID from context.
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func RequestID(ctx context.Context) string {
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id, _ := ctx.Value(ridCtxKey).(string)
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return id
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}
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// AddRequestID returns a gin middleware which adds a unique ID to each request (both response header and context).
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func AddRequestID(header string) gin.HandlerFunc {
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log.Hook(func(ctx context.Context, kvs []kv.Field) []kv.Field {
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if id, _ := ctx.Value(ridCtxKey).(string); id != "" {
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// Add stored request ID to log entry fields.
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return append(kvs, kv.Field{K: "requestID", V: id})
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}
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return kvs
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})
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return func(c *gin.Context) {
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// Look for existing ID.
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id := c.GetHeader(header)
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if id == "" {
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// Generate new ID.
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//
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// 0:8 = timestamp
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// 8:12 = entropy
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id = generateID()
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// Set the request ID in the req header in case we pass the request along
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// to another service
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c.Request.Header.Set(header, id)
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}
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// Store request ID in new request ctx and set new gin request obj.
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ctx := context.WithValue(c.Request.Context(), ridCtxKey, id)
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c.Request = c.Request.WithContext(ctx)
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// Set the request ID in the rsp header.
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c.Writer.Header().Set(header, id)
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}
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}
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