eTag字段支持service更改设置

sonic-iOS/Sonic/Cache/SonicCache.m

@@ -465,10 +465,22 @@ - (SonicCacheItem *)saveHtmlString:(NSString *)htmlString
     return cacheItem;
 }
 
+- (NSString *)getSonicHeaderETagWithHeaders:(NSDictionary *)headers
+{
+    NSString *keyETag = [headers objectForKey:[SonicHeaderKeyCustomeETag lowercaseString]];
+    if (keyETag && [keyETag isKindOfClass:[NSString class]] && keyETag.length > 0) {
+        // do nothing
+    } else {
+        keyETag = [SonicHeaderKeyETag lowercaseString];
+    }
+
+    return [headers objectForKey:keyETag];
+}
+
 - (NSDictionary *)createConfigFromResponseHeaders:(NSDictionary *)headers
 {
     //Etag,template-tag
-    NSString *eTag = headers[SonicHeaderKeyETag];
+    NSString *eTag = [self getSonicHeaderETagWithHeaders:headers];
     NSString *templateTag = headers[SonicHeaderKeyTemplate];
     NSTimeInterval timeNow = (long)[[NSDate date ]timeIntervalSince1970]*1000;
     NSString *localRefresh = [@(timeNow) stringValue];
@@ -479,6 +491,8 @@ - (NSDictionary *)createConfigFromResponseHeaders:(NSDictionary *)headers
     eTag = eTag.length > 0? eTag:@"";
 
     NSDictionary *cfgDict = @{
+                              // SonicHeaderKeyCustomeETag:[self getCustomSonicHeaderKeyETagWithHeaders:headers]
+                              // [self getCustomSonicHeaderKeyETagWithHeaders:headers]:eTag
                               SonicHeaderKeyETag:eTag,
                               SonicHeaderKeyTemplate:templateTag,
                               kSonicLocalRefreshTime:localRefresh,

sonic-iOS/Sonic/Network/SonicServer.m

@@ -282,6 +282,18 @@ - (NSString *)responseHeaderForKey:(NSString *)aKey
     return header;
 }
 
+- (NSString *)getSonicHeaderETagWithHeaders:(NSDictionary *)headers
+{
+    NSString *keyETag = [headers objectForKey:[SonicHeaderKeyCustomeETag lowercaseString]];
+    if (keyETag && [keyETag isKindOfClass:[NSString class]] && keyETag.length > 0) {
+        // do nothing
+    } else {
+        keyETag = [SonicHeaderKeyETag lowercaseString];
+    }
+
+    return [headers objectForKey:keyETag];
+}
+
 - (NSDictionary *)sonicItemForCache
 {
     if (self.isCompletion) {
@@ -294,7 +306,7 @@ - (NSDictionary *)sonicItemForCache
                 self.data = splitResult[kSonicDataFieldName];
 
                 NSMutableDictionary *headers = [[_response.allHeaderFields mutableCopy]autorelease];
-                NSString *responseEtag = [headers objectForKey:[SonicHeaderKeyETag lowercaseString]];
+                NSString *responseEtag = [self getSonicHeaderETagWithHeaders:headers];
                 if (!responseEtag) {
                     responseEtag = getDataSha1([self.htmlString dataUsingEncoding:NSUTF8StringEncoding]);
                     [headers setObject:responseEtag forKey:[SonicHeaderKeyETag lowercaseString]];
@@ -336,7 +348,7 @@ - (BOOL)isValidateSonicResponse:(NSHTTPURLResponse *)response
         return NO;
     }
 
-    if ([response.allHeaderFields[SonicHeaderKeyETag] length] == 0) {
+    if ([[self getSonicHeaderETagWithHeaders:response.allHeaderFields] length] == 0) {
         return NO;
     }
 
@@ -381,7 +393,7 @@ - (void)connection:(SonicConnection *)connection didReceiveResponse:(NSHTTPURLRe
         }
 
         // fix Weak-Etag case like -> etag: W/"66f0-m2UmCBEh78dNYPv+boO5ETXk4FU".[https://github.com/Tencent/VasSonic/issues/128]
-        NSString *eTag = [headers objectForKey:[SonicHeaderKeyETag lowercaseString]];
+        NSString *eTag = [self getSonicHeaderETagWithHeaders:headers];
         if ([eTag hasPrefix:@"W/"] && eTag.length > 3) {
             // fix Weak-Etag get value length error
             NSString *eTagValue = [eTag substringFromIndex:2];
@@ -463,7 +475,7 @@ - (void)connectionDidCompleteWithoutError:(SonicConnection *)connection
                     [headers setValue:@"true" forKey:[SonicHeaderKeyCacheOffline lowercaseString]];
                 }
                 NSString *htmlSha1 = nil;
-                NSString *responseEtag = [headers objectForKey:[SonicHeaderKeyETag lowercaseString]];
+                NSString *responseEtag = [self getSonicHeaderETagWithHeaders:headers];
                 if (!responseEtag) {
                     responseEtag = htmlSha1 = getDataSha1([self.htmlString dataUsingEncoding:NSUTF8StringEncoding]);
                     [headers setObject:responseEtag forKey:[SonicHeaderKeyETag lowercaseString]];

sonic-iOS/Sonic/Session/SonicSession.m

@@ -287,13 +287,25 @@ - (void)syncCookies
     }
 }
 
+- (NSString *)getSonicHeaderETagWithHeaders:(NSDictionary *)headers
+{
+    NSString *keyETag = [headers objectForKey:[SonicHeaderKeyCustomeETag lowercaseString]];
+    if (keyETag && [keyETag isKindOfClass:[NSString class]] && keyETag.length > 0) {
+        // do nothing
+    } else {
+        keyETag = [SonicHeaderKeyETag lowercaseString];
+    }
+
+    return [headers objectForKey:keyETag];
+}
+
 - (NSDictionary *)buildRequestHeaderFields
 {
     NSDictionary *cacheHeaders = self.cacheConfigHeaders;
     NSMutableDictionary *requestHeaders = [NSMutableDictionary dictionary];
 
     if (cacheHeaders) {
-        NSString *eTag = cacheHeaders[SonicHeaderKeyETag];
+        NSString *eTag = [self getSonicHeaderETagWithHeaders:cacheHeaders];
         if (eTag.length > 0) {
             [requestHeaders setObject:eTag forKey:HTTPHeaderKeyIfNoneMatch];
         }

sonic-iOS/Sonic/SonicConstants.h

@@ -150,6 +150,12 @@ typedef NS_ENUM(NSInteger, SonicErrorType) {
  */
 #define SonicHeaderKeyETag     @"etag"
 
+/**
+ * Pass Etag through this field.
+ * This header represents that the "eTag" key can be modified by service.
+ */
+#define SonicHeaderKeyCustomeETag     @"sonic-etag-key"
+
 /**
  * Content-Security-Policy key for header.
  */