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1 /*
2  * Copyright 2010, The Android Open Source Project
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  *  * Redistributions of source code must retain the above copyright
8  *    notice, this list of conditions and the following disclaimer.
9  *  * Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  *
13  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  */
25 
26 #define LOG_TAG "UrlInterceptResponse"
27 #include "config.h"
28 
29 #include "JNIUtility.h"
30 #include "UrlInterceptResponse.h"
31 #include "WebCoreJni.h"
32 
33 #include <utils/Log.h>
34 
35 namespace android {
36 
37 class JavaInputStreamWrapper {
38 public:
JavaInputStreamWrapper(JNIEnv * env,jobject inputStream)39     JavaInputStreamWrapper(JNIEnv* env, jobject inputStream)
40             : m_inputStream(env->NewGlobalRef(inputStream))
41             , m_buffer(0) {
42         LOG_ALWAYS_FATAL_IF(!inputStream);
43         jclass inputStreamClass = env->FindClass("java/io/InputStream");
44         LOG_ALWAYS_FATAL_IF(!inputStreamClass);
45         m_read = env->GetMethodID(inputStreamClass, "read", "([B)I");
46         LOG_ALWAYS_FATAL_IF(!m_read);
47         m_close = env->GetMethodID(inputStreamClass, "close", "()V");
48         LOG_ALWAYS_FATAL_IF(!m_close);
49         env->DeleteLocalRef(inputStreamClass);
50     }
51 
~JavaInputStreamWrapper()52     ~JavaInputStreamWrapper() {
53         JNIEnv* env = JSC::Bindings::getJNIEnv();
54         env->CallVoidMethod(m_inputStream, m_close);
55         checkException(env);
56         env->DeleteGlobalRef(m_inputStream);
57         // In case we never call read().
58         if (m_buffer)
59             env->DeleteGlobalRef(m_buffer);
60     }
61 
read(std::vector<char> * out)62     void read(std::vector<char>* out) {
63         JNIEnv* env = JSC::Bindings::getJNIEnv();
64         // Initialize our read buffer to the capacity of out.
65         if (!m_buffer) {
66             m_buffer = env->NewByteArray(out->capacity());
67             m_buffer = (jbyteArray) env->NewGlobalRef(m_buffer);
68         }
69         int size = (int) env->CallIntMethod(m_inputStream, m_read, m_buffer);
70         if (checkException(env) || size < 0)
71             return;
72         // Copy from m_buffer to out.
73         out->resize(size);
74         env->GetByteArrayRegion(m_buffer, 0, size, (jbyte*)&out->front());
75     }
76 
77 private:
78     jobject    m_inputStream;
79     jbyteArray m_buffer;
80     jmethodID  m_read;
81     jmethodID  m_close;
82 };
83 
UrlInterceptResponse(JNIEnv * env,jobject response)84 UrlInterceptResponse::UrlInterceptResponse(JNIEnv* env, jobject response) {
85     jclass javaResponse = env->FindClass("android/webkit/WebResourceResponse");
86     LOG_ALWAYS_FATAL_IF(!javaResponse);
87     jfieldID mimeType = env->GetFieldID(javaResponse, "mMimeType",
88                                         "Ljava/lang/String;");
89     LOG_ALWAYS_FATAL_IF(!mimeType);
90     jfieldID encoding = env->GetFieldID(javaResponse, "mEncoding",
91                                         "Ljava/lang/String;");
92     LOG_ALWAYS_FATAL_IF(!encoding);
93     jfieldID inputStream = env->GetFieldID(javaResponse, "mInputStream",
94                                            "Ljava/io/InputStream;");
95     LOG_ALWAYS_FATAL_IF(!inputStream);
96 
97     jobject stream = env->GetObjectField(response, inputStream);
98     if (stream)
99         m_inputStream.set(new JavaInputStreamWrapper(env, stream));
100 
101     jstring mimeStr = (jstring) env->GetObjectField(response, mimeType);
102     jstring encodingStr = (jstring) env->GetObjectField(response, encoding);
103 
104     if (mimeStr) {
105         const char* s = env->GetStringUTFChars(mimeStr, NULL);
106         m_mimeType.assign(s, env->GetStringUTFLength(mimeStr));
107         env->ReleaseStringUTFChars(mimeStr, s);
108     }
109     if (encodingStr) {
110         const char* s = env->GetStringUTFChars(encodingStr, NULL);
111         m_encoding.assign(s, env->GetStringUTFLength(encodingStr));
112         env->ReleaseStringUTFChars(encodingStr, s);
113     }
114 
115     env->DeleteLocalRef(javaResponse);
116     env->DeleteLocalRef(stream);
117     env->DeleteLocalRef(mimeStr);
118     env->DeleteLocalRef(encodingStr);
119 }
120 
~UrlInterceptResponse()121 UrlInterceptResponse::~UrlInterceptResponse() {
122     // Cannot be inlined because of JavaInputStreamWrapper visibility.
123 }
124 
readStream(std::vector<char> * out) const125 bool UrlInterceptResponse::readStream(std::vector<char>* out) const {
126     if (!m_inputStream)
127         return false;
128     m_inputStream->read(out);
129     return true;
130 }
131 
132 }  // namespace android
133