String createCanonicalRequest(HttpUriRequest request) {
StringBuilder result = new StringBuilder();
result.append(request.getMethod()).append('\n');
String path = request.getURI().getPath();
if (path.isEmpty()) {
path = "/";
}
result.append(path).append('\n');
String queryString = request.getURI().getQuery();
queryString = queryString != null ? queryString : "";
addCanonicalQueryString(queryString, result).append('\n');
addCanonicalHeaders(request, result).append('\n');
HttpEntity entity = null;
try {
if (request instanceof HttpEntityEnclosingRequestBase) {
entity = ((HttpEntityEnclosingRequestBase) request).getEntity();
} else {
entity = new StringEntity("");
}
InputStream content = entity.getContent();
addHashedPayload(content, result);
} catch (IOException e) {
throw new RuntimeException("Could not create hash for entity " + entity, e);
}
return result.toString();
}
StringBuilder addSignedHeaders(
SortedMap<String, String> sortedFormattedHeaders, StringBuilder builder) {
int startingLength = builder.length();
for (String headerName : sortedFormattedHeaders.keySet()) {
if (builder.length() > startingLength) {
builder.append(';');
}
builder.append(headerName);
}
return builder;
}
StringBuilder addCanonicalHeaders(
SortedMap<String, String> sortedFormattedHeaders, StringBuilder builder) {
for (Map.Entry<String, String> entry : sortedFormattedHeaders.entrySet()) {
builder.append(entry.getKey()).append(':').append(entry.getValue()).append('\n');
}
return builder;
}
StringBuilder addCanonicalQueryString(String queryString, StringBuilder builder) {
int startingLength = builder.length();
SortedMap<String, String> encodedParams = new TreeMap<>();
for (String queryParam : queryString.split("&")) {
if (!queryParam.isEmpty()) {
String[] parts = queryParam.split("=", 2);
encodedParams.put(encodeQueryStringValue(parts[0]), encodeQueryStringValue(parts[1]));
}
}
for (Map.Entry<String, String> entry : encodedParams.entrySet()) {
if (builder.length() > startingLength) {
builder.append('&');
}
builder.append(entry.getKey()).append('=').append(entry.getValue());
}
return builder;
}
StringBuilder addHashedPayload(InputStream payload, StringBuilder builder) throws IOException {
return builder.append(toHexString(sha256(payload)));
}