Bug 1481176 - P1. Export GetParameterHTTP as static method. r=valentin,r=bzbarsky

nsContentTypeParser used internally a nsIMIMEHeaderParam reference, effectively limiting its use on the main thread, and as such restricting any methods handling mime type there too.

nsContentTypeParser only made use of a single method nsMIMEHeaderParamImpl::GetParameterHTTP, so we make that method static and export it via nsNetUtil.

Differential Revision: https://phabricator.services.mozilla.com/D2788

netwerk/base/nsNetUtil.cpp

@@ -80,6 +80,7 @@
 #include "nsICertOverrideService.h"
 #include "nsQueryObject.h"
 #include "mozIThirdPartyUtil.h"
+#include "../mime/nsMIMEHeaderParamImpl.h"
 
 #include <limits>
 
@@ -3259,5 +3260,14 @@ InScriptableRange(uint64_t val)
     return val <= kJS_MAX_SAFE_UINTEGER;
 }
 
+nsresult
+GetParameterHTTP(const nsACString& aHeaderVal,
+                 const char* aParamName,
+                 nsAString& aResult)
+{
+  return nsMIMEHeaderParamImpl::GetParameterHTTP(
+    aHeaderVal, aParamName, aResult);
+}
+
 } // namespace net
 } // namespace mozilla

netwerk/base/nsNetUtil.h

@@ -991,6 +991,24 @@ bool InScriptableRange(int64_t val);
 // Make sure a 64bit value can be captured by JS MAX_SAFE_INTEGER
 bool InScriptableRange(uint64_t val);
 
+/**
+ * Given the value of a single header field  (such as
+ * Content-Disposition and Content-Type) and the name of a parameter
+ * (e.g. filename, name, charset), returns the value of the parameter.
+ * See nsIMIMEHeaderParam.idl for more information.
+ *
+ * @param  aHeaderVal        a header string to get the value of a parameter
+ *                           from.
+ * @param  aParamName        the name of a MIME header parameter (e.g.
+ *                           filename, name, charset). If empty or nullptr,
+ *                           returns the first (possibly) _unnamed_ 'parameter'.
+ * @return the value of <code>aParamName</code> in Unichar(UTF-16).
+ */
+nsresult
+GetParameterHTTP(const nsACString& aHeaderVal,
+                 const char* aParamName,
+                 nsAString& aResult);
+
 } // namespace net
 } // namespace mozilla
 

netwerk/mime/nsMIMEHeaderParamImpl.cpp

@@ -64,7 +64,23 @@ nsMIMEHeaderParamImpl::GetParameterHTTP(const nsACString& aHeaderVal,
                         aFallbackCharset, aTryLocaleCharset, aLang, aResult);
 }
 
+/* static */
+nsresult
+nsMIMEHeaderParamImpl::GetParameterHTTP(const nsACString& aHeaderVal,
+                                        const char *aParamName,
+                                        nsAString& aResult)
+{
+  return DoGetParameter(aHeaderVal,
+                        aParamName,
+                        HTTP_FIELD_ENCODING,
+                        EmptyCString(),
+                        false,
+                        nullptr,
+                        aResult);
+}
+
 // XXX : aTryLocaleCharset is not yet effective.
+/* static */
 nsresult
 nsMIMEHeaderParamImpl::DoGetParameter(const nsACString& aHeaderVal,
                                       const char *aParamName,
@@ -355,6 +371,7 @@ nsMIMEHeaderParamImpl::GetParameterInternal(const char *aHeaderValue,
 }
 
 
+/* static */
 nsresult
 nsMIMEHeaderParamImpl::DoParameterInternal(const char *aHeaderValue,
                                            const char *aParamName,

netwerk/mime/nsMIMEHeaderParamImpl.h

@@ -14,6 +14,16 @@ public:
   NS_DECL_NSIMIMEHEADERPARAM
 
   nsMIMEHeaderParamImpl() = default;
+
+  /**
+   * Identical to calling
+   * GetParameterHTTP(aHeaderVal, aParameterName, EmptyCString(), false, nullptr, aResult)
+   * See nsIMIMEHeaderParam.idl for more information.
+   */
+  static nsresult GetParameterHTTP(const nsACString& aHeaderVal,
+                                   const char *aParamName,
+                                   nsAString &aResult);
+
 private:
   virtual ~nsMIMEHeaderParamImpl() = default;
   enum ParamDecoding {
@@ -21,7 +31,7 @@ private:
     HTTP_FIELD_ENCODING
   };
 
-  nsresult DoGetParameter(const nsACString& aHeaderVal,
+  static nsresult DoGetParameter(const nsACString& aHeaderVal,
                                  const char *aParamName,
                                  ParamDecoding aDecoding,
                                  const nsACString& aFallbackCharset,
@@ -29,13 +39,12 @@ private:
                                  char **aLang,
                                  nsAString& aResult);
 
-  nsresult DoParameterInternal(const char *aHeaderValue,
+  static nsresult DoParameterInternal(const char *aHeaderValue,
                                       const char *aParamName,
                                       ParamDecoding aDecoding,
                                       char **aCharset,
                                       char **aLang,
                                       char **aResult);
-
 };
 
 #endif