forked from fnproject/fn
/
server_options.go
54 lines (44 loc) · 1.32 KB
/
server_options.go
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package server
import (
"context"
"fmt"
"net/http"
"github.com/gin-gonic/gin"
)
type ServerOption func(context.Context, *Server) error
func EnableShutdownEndpoint(ctx context.Context, halt context.CancelFunc) ServerOption {
return func(ctx context.Context, s *Server) error {
s.Router.GET("/shutdown", s.handleShutdown(halt))
return nil
}
}
func LimitRequestBody(max int64) ServerOption {
return func(ctx context.Context, s *Server) error {
s.Router.Use(limitRequestBody(max))
return nil
}
}
func limitRequestBody(max int64) func(c *gin.Context) {
return func(c *gin.Context) {
cl := int64(c.Request.ContentLength)
if cl > max {
// try to deny this quickly, instead of just letting it get lopped off
handleErrorResponse(c, errTooBig{cl, max})
c.Abort()
return
}
// if no Content-Length specified, limit how many bytes we read and error
// if we hit the max (intercontinental anti-air missile defense system).
// read http.MaxBytesReader for gritty details..
c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, max)
c.Next()
}
}
// models.APIError
type errTooBig struct {
n, max int64
}
func (e errTooBig) Code() int { return http.StatusRequestEntityTooLarge }
func (e errTooBig) Error() string {
return fmt.Sprintf("Content-Length too large for this server, %d > max %d", e.n, e.max)
}