func()

in oss/signer/v1.go [83:163]

• 62 lines of code
• 14 McCabe index (conditional complexity)

func (*SignerV1) calcStringToSign(date string, signingCtx *SigningContext) string {
	/*
		SignToString =
			VERB + "\n"
			+ Content-MD5 + "\n"
			+ Content-Type + "\n"
			+ Date + "\n"
			+ CanonicalizedOSSHeaders
			+ CanonicalizedResource
		Signature = base64(hmac-sha1(AccessKeySecret, SignToString))
	*/
	request := signingCtx.Request

	contentMd5 := request.Header.Get(contentMd5Header)
	contentType := request.Header.Get(contentTypeHeader)

	//CanonicalizedOSSHeaders
	var headers []string
	for k := range request.Header {
		lowerCaseKey := strings.ToLower(k)
		if strings.HasPrefix(lowerCaseKey, ossHeaderPreifx) {
			headers = append(headers, lowerCaseKey)
		}
	}
	sort.Strings(headers)
	headerItems := make([]string, len(headers))
	for i, k := range headers {
		headerValues := make([]string, len(request.Header.Values(k)))
		for i, v := range request.Header.Values(k) {
			headerValues[i] = strings.TrimSpace(v)
		}
		headerItems[i] = k + ":" + strings.Join(headerValues, ",") + "\n"
	}
	canonicalizedOSSHeaders := strings.Join(headerItems, "")

	//CanonicalizedResource
	query := request.URL.Query()
	var params []string
	for k := range query {
		if _, ok := requiredSignedParametersMap[k]; ok {
			params = append(params, k)
		} else if strings.HasPrefix(k, ossHeaderPreifx) {
			params = append(params, k)
		} else if isSubResource(signingCtx.SubResource, k) {
			params = append(params, k)
		}
	}
	sort.Strings(params)
	paramItems := make([]string, len(params))
	for i, k := range params {
		v := query.Get(k)
		if len(v) > 0 {
			paramItems[i] = k + "=" + v
		} else {
			paramItems[i] = k
		}
	}
	subResource := strings.Join(paramItems, "&")
	canonicalizedResource := "/"
	if signingCtx.Bucket != nil {
		canonicalizedResource += *signingCtx.Bucket + "/"
	}
	if signingCtx.Key != nil {
		canonicalizedResource += *signingCtx.Key
	}
	if subResource != "" {
		canonicalizedResource += "?" + subResource
	}

	// string to Sign
	stringToSign :=
		request.Method + "\n" +
			contentMd5 + "\n" +
			contentType + "\n" +
			date + "\n" +
			canonicalizedOSSHeaders +
			canonicalizedResource

	//fmt.Printf("stringToSign:%s\n", stringToSign)
	return stringToSign
}