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/*
* Copyright (C) 2012 The Android Open Source Project
*
* 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 okhttp3.internal.http;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
import okhttp3.Challenge;
import okhttp3.Cookie;
import okhttp3.CookieJar;
import okhttp3.Headers;
import okhttp3.HttpUrl;
import okhttp3.Request;
import okhttp3.Response;
import static java.net.HttpURLConnection.HTTP_NOT_MODIFIED;
import static java.net.HttpURLConnection.HTTP_NO_CONTENT;
import static okhttp3.internal.Util.equal;
import static okhttp3.internal.http.StatusLine.HTTP_CONTINUE;
/** Headers and utilities for internal use by OkHttp. */
public final class HttpHeaders {
private HttpHeaders() {
}
public static long contentLength(Response response) {
return contentLength(response.headers());
}
public static long contentLength(Headers headers) {
return stringToLong(headers.get("Content-Length"));
}
private static long stringToLong(String s) {
if (s == null) return -1;
try {
return Long.parseLong(s);
} catch (NumberFormatException e) {
return -1;
}
}
/**
* Returns true if none of the Vary headers have changed between {@code cachedRequest} and {@code
* newRequest}.
*/
public static boolean varyMatches(
Response cachedResponse, Headers cachedRequest, Request newRequest) {
for (String field : varyFields(cachedResponse)) {
if (!equal(cachedRequest.values(field), newRequest.headers(field))) return false;
}
return true;
}
/**
* Returns true if a Vary header contains an asterisk. Such responses cannot be cached.
*/
public static boolean hasVaryAll(Response response) {
return hasVaryAll(response.headers());
}
/**
* Returns true if a Vary header contains an asterisk. Such responses cannot be cached.
*/
public static boolean hasVaryAll(Headers responseHeaders) {
return varyFields(responseHeaders).contains("*");
}
private static Set varyFields(Response response) {
return varyFields(response.headers());
}
/**
* Returns the names of the request headers that need to be checked for equality when caching.
*/
public static Set varyFields(Headers responseHeaders) {
Set result = Collections.emptySet();
for (int i = 0, size = responseHeaders.size(); i < size; i++) {
if (!"Vary".equalsIgnoreCase(responseHeaders.name(i))) continue;
String value = responseHeaders.value(i);
if (result.isEmpty()) {
result = new TreeSet<>(String.CASE_INSENSITIVE_ORDER);
}
for (String varyField : value.split(",")) {
result.add(varyField.trim());
}
}
return result;
}
/**
* Returns the subset of the headers in {@code response}'s request that impact the content of
* response's body.
*/
public static Headers varyHeaders(Response response) {
// Use the request headers sent over the network, since that's what the
// response varies on. Otherwise OkHttp-supplied headers like
// "Accept-Encoding: gzip" may be lost.
Headers requestHeaders = response.networkResponse().request().headers();
Headers responseHeaders = response.headers();
return varyHeaders(requestHeaders, responseHeaders);
}
/**
* Returns the subset of the headers in {@code requestHeaders} that impact the content of
* response's body.
*/
public static Headers varyHeaders(Headers requestHeaders, Headers responseHeaders) {
Set varyFields = varyFields(responseHeaders);
if (varyFields.isEmpty()) return new Headers.Builder().build();
Headers.Builder result = new Headers.Builder();
for (int i = 0, size = requestHeaders.size(); i < size; i++) {
String fieldName = requestHeaders.name(i);
if (varyFields.contains(fieldName)) {
result.add(fieldName, requestHeaders.value(i));
}
}
return result.build();
}
/** Parse RFC 2617 challenges. This API is only interested in the scheme name and realm. */
public static List parseChallenges(Headers responseHeaders, String challengeHeader) {
// auth-scheme = token
// auth-param = token "=" ( token | quoted-string )
// challenge = auth-scheme 1*SP 1#auth-param
// realm = "realm" "=" realm-value
// realm-value = quoted-string
List result = new ArrayList<>();
for (int i = 0, size = responseHeaders.size(); i < size; i++) {
if (!challengeHeader.equalsIgnoreCase(responseHeaders.name(i))) {
continue;
}
String value = responseHeaders.value(i);
int pos = 0;
while (pos < value.length()) {
int tokenStart = pos;
pos = skipUntil(value, pos, " ");
String scheme = value.substring(tokenStart, pos).trim();
pos = skipWhitespace(value, pos);
// TODO: This currently only handles schemes with a 'realm' parameter;
// It needs to be fixed to handle any scheme and any parameters
// http://code.google.com/p/android/issues/detail?id=11140
if (!value.regionMatches(true, pos, "realm=\"", 0, "realm=\"".length())) {
break; // Unexpected challenge parameter; give up!
}
pos += "realm=\"".length();
int realmStart = pos;
pos = skipUntil(value, pos, "\"");
String realm = value.substring(realmStart, pos);
pos++; // Consume '"' close quote.
pos = skipUntil(value, pos, ",");
pos++; // Consume ',' comma.
pos = skipWhitespace(value, pos);
result.add(new Challenge(scheme, realm));
}
}
return result;
}
public static void receiveHeaders(CookieJar cookieJar, HttpUrl url, Headers headers) {
if (cookieJar == CookieJar.NO_COOKIES) return;
List cookies = Cookie.parseAll(url, headers);
if (cookies.isEmpty()) return;
cookieJar.saveFromResponse(url, cookies);
}
/** Returns true if the response must have a (possibly 0-length) body. See RFC 7231. */
public static boolean hasBody(Response response) {
// HEAD requests never yield a body regardless of the response headers.
if (response.request().method().equals("HEAD")) {
return false;
}
int responseCode = response.code();
if ((responseCode < HTTP_CONTINUE || responseCode >= 200)
&& responseCode != HTTP_NO_CONTENT
&& responseCode != HTTP_NOT_MODIFIED) {
return true;
}
// If the Content-Length or Transfer-Encoding headers disagree with the response code, the
// response is malformed. For best compatibility, we honor the headers.
if (contentLength(response) != -1
|| "chunked".equalsIgnoreCase(response.header("Transfer-Encoding"))) {
return true;
}
return false;
}
/**
* Returns the next index in {@code input} at or after {@code pos} that contains a character from
* {@code characters}. Returns the input length if none of the requested characters can be found.
*/
public static int skipUntil(String input, int pos, String characters) {
for (; pos < input.length(); pos++) {
if (characters.indexOf(input.charAt(pos)) != -1) {
break;
}
}
return pos;
}
/**
* Returns the next non-whitespace character in {@code input} that is white space. Result is
* undefined if input contains newline characters.
*/
public static int skipWhitespace(String input, int pos) {
for (; pos < input.length(); pos++) {
char c = input.charAt(pos);
if (c != ' ' && c != '\t') {
break;
}
}
return pos;
}
/**
* Returns {@code value} as a positive integer, or 0 if it is negative, or {@code defaultValue} if
* it cannot be parsed.
*/
public static int parseSeconds(String value, int defaultValue) {
try {
long seconds = Long.parseLong(value);
if (seconds > Integer.MAX_VALUE) {
return Integer.MAX_VALUE;
} else if (seconds < 0) {
return 0;
} else {
return (int) seconds;
}
} catch (NumberFormatException e) {
return defaultValue;
}
}
}
