first commit: one-api base code + SAAS plan document

common/gin.go

@@ -0,0 +1,53 @@
+package common
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+	"github.com/songquanpeng/one-api/common/ctxkey"
+)
+
+func GetRequestBody(c *gin.Context) ([]byte, error) {
+	requestBody, _ := c.Get(ctxkey.KeyRequestBody)
+	if requestBody != nil {
+		return requestBody.([]byte), nil
+	}
+	requestBody, err := io.ReadAll(c.Request.Body)
+	if err != nil {
+		return nil, err
+	}
+	_ = c.Request.Body.Close()
+	c.Set(ctxkey.KeyRequestBody, requestBody)
+	return requestBody.([]byte), nil
+}
+
+func UnmarshalBodyReusable(c *gin.Context, v any) error {
+	requestBody, err := GetRequestBody(c)
+	if err != nil {
+		return err
+	}
+	contentType := c.Request.Header.Get("Content-Type")
+	if strings.HasPrefix(contentType, "application/json") {
+		err = json.Unmarshal(requestBody, &v)
+	} else {
+		c.Request.Body = io.NopCloser(bytes.NewBuffer(requestBody))
+		err = c.ShouldBind(&v)
+	}
+	if err != nil {
+		return err
+	}
+	// Reset request body
+	c.Request.Body = io.NopCloser(bytes.NewBuffer(requestBody))
+	return nil
+}
+
+func SetEventStreamHeaders(c *gin.Context) {
+	c.Writer.Header().Set("Content-Type", "text/event-stream")
+	c.Writer.Header().Set("Cache-Control", "no-cache")
+	c.Writer.Header().Set("Connection", "keep-alive")
+	c.Writer.Header().Set("Transfer-Encoding", "chunked")
+	c.Writer.Header().Set("X-Accel-Buffering", "no")
+}