1 files changed, 224 insertions, 0 deletions

diff --git a/vendor/github.com/minio/minio-go/v7/pkg/signer/request-signature-streaming-unsigned-trailer.go b/vendor/github.com/minio/minio-go/v7/pkg/signer/request-signature-streaming-unsigned-trailer.go
new file mode 100644
index 0000000..77540e2
--- /dev/null
+++ b/vendor/github.com/minio/minio-go/v7/pkg/signer/request-signature-streaming-unsigned-trailer.go
@@ -0,0 +1,224 @@
+/*
+ * MinIO Go Library for Amazon S3 Compatible Cloud Storage
+ * Copyright 2022 MinIO, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package signer
+
+import (
+        "bytes"
+        "fmt"
+        "io"
+        "net/http"
+        "strconv"
+        "strings"
+        "time"
+)
+
+// getUnsignedChunkLength - calculates the length of chunk metadata
+func getUnsignedChunkLength(chunkDataSize int64) int64 {
+        return int64(len(fmt.Sprintf("%x", chunkDataSize))) +
+                crlfLen +
+                chunkDataSize +
+                crlfLen
+}
+
+// getUSStreamLength - calculates the length of the overall stream (data + metadata)
+func getUSStreamLength(dataLen, chunkSize int64, trailers http.Header) int64 {
+        if dataLen <= 0 {
+                return 0
+        }
+
+        chunksCount := int64(dataLen / chunkSize)
+        remainingBytes := int64(dataLen % chunkSize)
+        streamLen := int64(0)
+        streamLen += chunksCount * getUnsignedChunkLength(chunkSize)
+        if remainingBytes > 0 {
+                streamLen += getUnsignedChunkLength(remainingBytes)
+        }
+        streamLen += getUnsignedChunkLength(0)
+        if len(trailers) > 0 {
+                for name, placeholder := range trailers {
+                        if len(placeholder) > 0 {
+                                streamLen += int64(len(name) + len(trailerKVSeparator) + len(placeholder[0]) + 1)
+                        }
+                }
+                streamLen += crlfLen
+        }
+
+        return streamLen
+}
+
+// prepareStreamingRequest - prepares a request with appropriate
+// headers before computing the seed signature.
+func prepareUSStreamingRequest(req *http.Request, sessionToken string, dataLen int64, timestamp time.Time) {
+        req.TransferEncoding = []string{"aws-chunked"}
+        if sessionToken != "" {
+                req.Header.Set("X-Amz-Security-Token", sessionToken)
+        }
+
+        req.Header.Set("X-Amz-Date", timestamp.Format(iso8601DateFormat))
+        // Set content length with streaming signature for each chunk included.
+        req.ContentLength = getUSStreamLength(dataLen, int64(payloadChunkSize), req.Trailer)
+}
+
+// StreamingUSReader implements chunked upload signature as a reader on
+// top of req.Body's ReaderCloser chunk header;data;... repeat
+type StreamingUSReader struct {
+        contentLen     int64         // Content-Length from req header
+        baseReadCloser io.ReadCloser // underlying io.Reader
+        bytesRead      int64         // bytes read from underlying io.Reader
+        buf            bytes.Buffer  // holds signed chunk
+        chunkBuf       []byte        // holds raw data read from req Body
+        chunkBufLen    int           // no. of bytes read so far into chunkBuf
+        done           bool          // done reading the underlying reader to EOF
+        chunkNum       int
+        totalChunks    int
+        lastChunkSize  int
+        trailer        http.Header
+}
+
+// writeChunk - signs a chunk read from s.baseReader of chunkLen size.
+func (s *StreamingUSReader) writeChunk(chunkLen int, addCrLf bool) {
+        s.buf.WriteString(strconv.FormatInt(int64(chunkLen), 16) + "\r\n")
+
+        // Write chunk data into streaming buffer
+        s.buf.Write(s.chunkBuf[:chunkLen])
+
+        // Write the chunk trailer.
+        if addCrLf {
+                s.buf.Write([]byte("\r\n"))
+        }
+
+        // Reset chunkBufLen for next chunk read.
+        s.chunkBufLen = 0
+        s.chunkNum++
+}
+
+// addSignedTrailer - adds a trailer with the provided headers,
+// then signs a chunk and adds it to output.
+func (s *StreamingUSReader) addTrailer(h http.Header) {
+        olen := len(s.chunkBuf)
+        s.chunkBuf = s.chunkBuf[:0]
+        for k, v := range h {
+                s.chunkBuf = append(s.chunkBuf, []byte(strings.ToLower(k)+trailerKVSeparator+v[0]+"\n")...)
+        }
+
+        s.buf.Write(s.chunkBuf)
+        s.buf.WriteString("\r\n\r\n")
+
+        // Reset chunkBufLen for next chunk read.
+        s.chunkBuf = s.chunkBuf[:olen]
+        s.chunkBufLen = 0
+        s.chunkNum++
+}
+
+// StreamingUnsignedV4 - provides chunked upload
+func StreamingUnsignedV4(req *http.Request, sessionToken string, dataLen int64, reqTime time.Time) *http.Request {
+        // Set headers needed for streaming signature.
+        prepareUSStreamingRequest(req, sessionToken, dataLen, reqTime)
+
+        if req.Body == nil {
+                req.Body = io.NopCloser(bytes.NewReader([]byte("")))
+        }
+
+        stReader := &StreamingUSReader{
+                baseReadCloser: req.Body,
+                chunkBuf:       make([]byte, payloadChunkSize),
+                contentLen:     dataLen,
+                chunkNum:       1,
+                totalChunks:    int((dataLen+payloadChunkSize-1)/payloadChunkSize) + 1,
+                lastChunkSize:  int(dataLen % payloadChunkSize),
+        }
+        if len(req.Trailer) > 0 {
+                stReader.trailer = req.Trailer
+                // Remove...
+                req.Trailer = nil
+        }
+
+        req.Body = stReader
+
+        return req
+}
+
+// Read - this method performs chunk upload signature providing a
+// io.Reader interface.
+func (s *StreamingUSReader) Read(buf []byte) (int, error) {
+        switch {
+        // After the last chunk is read from underlying reader, we
+        // never re-fill s.buf.
+        case s.done:
+
+        // s.buf will be (re-)filled with next chunk when has lesser
+        // bytes than asked for.
+        case s.buf.Len() < len(buf):
+                s.chunkBufLen = 0
+                for {
+                        n1, err := s.baseReadCloser.Read(s.chunkBuf[s.chunkBufLen:])
+                        // Usually we validate `err` first, but in this case
+                        // we are validating n > 0 for the following reasons.
+                        //
+                        // 1. n > 0, err is one of io.EOF, nil (near end of stream)
+                        // A Reader returning a non-zero number of bytes at the end
+                        // of the input stream may return either err == EOF or err == nil
+                        //
+                        // 2. n == 0, err is io.EOF (actual end of stream)
+                        //
+                        // Callers should always process the n > 0 bytes returned
+                        // before considering the error err.
+                        if n1 > 0 {
+                                s.chunkBufLen += n1
+                                s.bytesRead += int64(n1)
+
+                                if s.chunkBufLen == payloadChunkSize ||
+                                        (s.chunkNum == s.totalChunks-1 &&
+                                                s.chunkBufLen == s.lastChunkSize) {
+                                        // Sign the chunk and write it to s.buf.
+                                        s.writeChunk(s.chunkBufLen, true)
+                                        break
+                                }
+                        }
+                        if err != nil {
+                                if err == io.EOF {
+                                        // No more data left in baseReader - last chunk.
+                                        // Done reading the last chunk from baseReader.
+                                        s.done = true
+
+                                        // bytes read from baseReader different than
+                                        // content length provided.
+                                        if s.bytesRead != s.contentLen {
+                                                return 0, fmt.Errorf("http: ContentLength=%d with Body length %d", s.contentLen, s.bytesRead)
+                                        }
+
+                                        // Sign the chunk and write it to s.buf.
+                                        s.writeChunk(0, len(s.trailer) == 0)
+                                        if len(s.trailer) > 0 {
+                                                // Trailer must be set now.
+                                                s.addTrailer(s.trailer)
+                                        }
+                                        break
+                                }
+                                return 0, err
+                        }
+
+                }
+        }
+        return s.buf.Read(buf)
+}
+
+// Close - this method makes underlying io.ReadCloser's Close method available.
+func (s *StreamingUSReader) Close() error {
+        return s.baseReadCloser.Close()
+}