126 lines
2.9 KiB
Go
126 lines
2.9 KiB
Go
package contentprocessor
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import (
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"bytes"
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"io"
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"net/http"
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"gitlab.com/gitlab-org/gitlab-workhorse/internal/headers"
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)
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type contentDisposition struct {
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rw http.ResponseWriter
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buf *bytes.Buffer
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wroteHeader bool
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flushed bool
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active bool
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removedResponseHeaders bool
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status int
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sentStatus bool
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}
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// SetContentHeaders buffers the response if Gitlab-Workhorse-Detect-Content-Type
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// header is found and set the proper content headers based on the current
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// value of content type and disposition
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func SetContentHeaders(h http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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cd := &contentDisposition{
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rw: w,
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buf: &bytes.Buffer{},
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status: http.StatusOK,
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}
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defer cd.flush()
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h.ServeHTTP(cd, r)
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})
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}
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func (cd *contentDisposition) Header() http.Header {
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return cd.rw.Header()
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}
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func (cd *contentDisposition) Write(data []byte) (int, error) {
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// Normal write if we don't need to buffer
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if cd.isUnbuffered() {
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cd.WriteHeader(cd.status)
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return cd.rw.Write(data)
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}
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// Write the new data into the buffer
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n, _ := cd.buf.Write(data)
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// If we have enough data to calculate the content headers then flush the Buffer
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var err error
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if cd.buf.Len() >= headers.MaxDetectSize {
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err = cd.flushBuffer()
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}
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return n, err
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}
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func (cd *contentDisposition) flushBuffer() error {
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if cd.isUnbuffered() {
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return nil
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}
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cd.flushed = true
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// If the buffer has any content then we calculate the content headers and
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// write in the response
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if cd.buf.Len() > 0 {
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cd.writeContentHeaders()
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cd.WriteHeader(cd.status)
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_, err := io.Copy(cd.rw, cd.buf)
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return err
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}
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// If no content is present in the buffer we still need to send the headers
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cd.WriteHeader(cd.status)
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return nil
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}
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func (cd *contentDisposition) writeContentHeaders() {
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if cd.wroteHeader {
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return
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}
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cd.wroteHeader = true
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contentType, contentDisposition := headers.SafeContentHeaders(cd.buf.Bytes(), cd.Header().Get(headers.ContentDispositionHeader))
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cd.Header().Set(headers.ContentTypeHeader, contentType)
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cd.Header().Set(headers.ContentDispositionHeader, contentDisposition)
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}
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func (cd *contentDisposition) WriteHeader(status int) {
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if cd.sentStatus {
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return
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}
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cd.status = status
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if cd.isUnbuffered() {
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cd.rw.WriteHeader(cd.status)
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cd.sentStatus = true
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}
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}
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// If we find any response header, then we must calculate the content headers
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// If we don't find any, the data is not buffered and it works as
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// a usual ResponseWriter
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func (cd *contentDisposition) isUnbuffered() bool {
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if !cd.removedResponseHeaders {
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if headers.IsDetectContentTypeHeaderPresent(cd.rw) {
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cd.active = true
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}
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cd.removedResponseHeaders = true
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// We ensure to clear any response header from the response
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headers.RemoveResponseHeaders(cd.rw)
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}
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return cd.flushed || !cd.active
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}
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func (cd *contentDisposition) flush() {
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cd.flushBuffer()
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}
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