path: root/embed/mozilla/EphyAboutModule.cpp

/*
 *  Copyright (C) 2001 Matt Aubury, Philip Langdale
 *  Copyright (C) 2004 Crispin Flowerday
 *  Copyright (C) 2005 Christian Persch
 *  Copyright (C) 2005 Adam Hooper
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 *  $Id$
 */

#include "mozilla-config.h"

#include "config.h"

#include <nsCOMPtr.h>
#include <nsIIOService.h>
#include <nsIServiceManager.h>
#include <nsIURI.h>
#include <nsIChannel.h>
#include <nsIOutputStream.h>
#include <nsIInputStream.h>
#include <nsIStorageStream.h>
#include <nsIInputStreamChannel.h>
#include <nsIScriptSecurityManager.h>
#include <nsNetCID.h>
#include <nsString.h>
#include <nsEscape.h>

#include <glib/gi18n.h>
#include <gtk/gtk.h>

#include "EphyAboutModule.h"
#include "EphyUtils.h"

#include "ephy-debug.h"

#include <string.h>

EphyAboutModule::EphyAboutModule()
{
    LOG ("EphyAboutModule ctor [%p]\n", this);
}

EphyAboutModule::~EphyAboutModule()
{
    LOG ("EphyAboutModule dtor [%p]\n", this);
}

NS_IMPL_ISUPPORTS1 (EphyAboutModule, nsIAboutModule)

/* nsIChannel newChannel (in nsIURI aURI); */
NS_IMETHODIMP
EphyAboutModule::NewChannel(nsIURI *aURI,
                nsIChannel **_retval)
{
    NS_ENSURE_ARG(aURI);

    nsCAutoString path;
    aURI->GetPath (path);

    if (strncmp (path.get(), "neterror", strlen ("neterror")) == 0)
    {
        return CreateErrorPage (aURI, _retval);
    }

    if (strncmp (path.get (), "epiphany", strlen ("epiphany")) == 0)
    {
        return Redirect (nsDependentCString ("file://" SHARE_DIR "/epiphany.xhtml"), _retval);
    }

    return NS_ERROR_ILLEGAL_VALUE;
}

/* private functions */

nsresult
EphyAboutModule::Redirect(const nsACString &aURL,
              nsIChannel **_retval)
{
    nsresult rv;
    nsCOMPtr<nsIIOService> ioService;
    rv = EphyUtils::GetIOService (getter_AddRefs (ioService));
    NS_ENSURE_SUCCESS (rv, rv);

    nsCOMPtr<nsIChannel> tempChannel;
    rv = ioService->NewChannel(aURL, nsnull, nsnull, getter_AddRefs(tempChannel));
    NS_ENSURE_SUCCESS (rv, rv);

    nsCOMPtr<nsIURI> uri;
    rv = ioService->NewURI(aURL, nsnull, nsnull, getter_AddRefs(uri));
    NS_ENSURE_SUCCESS (rv, rv);

    tempChannel->SetOriginalURI (uri);

    nsCOMPtr<nsIScriptSecurityManager> securityManager = 
            do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID, &rv);
    NS_ENSURE_SUCCESS (rv, rv);

    nsCOMPtr<nsIPrincipal> principal;
    rv = securityManager->GetCodebasePrincipal(uri, getter_AddRefs(principal));
    NS_ENSURE_SUCCESS (rv, rv);

    rv = tempChannel->SetOwner(principal);
    NS_ENSURE_SUCCESS (rv, rv);

    NS_ADDREF(*_retval = tempChannel);
    return rv;
}

nsresult
EphyAboutModule::ParseErrorURL(const char *aURL,
                   nsACString &aError,
                   nsACString &aRawOriginURL,
                   nsACString &aOriginURL,
                   nsACString &aOriginCharset)
{
    /* The error page URL is of the form "epiphany:error?e=<error>&u=<URL>&c=<charset>&d=<description>" */
    const char *query = strstr (aURL, "?");
    if (!query) return NS_ERROR_FAILURE;
    
    /* skip the '?' */
    ++query;
    
    char **params = g_strsplit (query, "&", -1);
    if (!params) return NS_ERROR_FAILURE;
    
    for (PRUint32 i = 0; params[i] != NULL; ++i)
    {
        char *param = params[i];
    
        if (strlen (param) <= 2) continue;
    
        switch (param[0])
        {
            case 'e':
                aError.Assign (nsUnescape (param + 2));
                break;
            case 'u':
                aRawOriginURL.Assign (param + 2);
                aOriginURL.Assign (nsUnescape (param + 2));
                break;
            case 'c':
                aOriginCharset.Assign (nsUnescape (param + 2));
                break;
            case 'd':
                /* we don't need mozilla's description parameter */
            default:
                break;
        }
    }

    g_strfreev (params);
    
    return NS_OK;
}

nsresult
EphyAboutModule::GetErrorMessage(nsIURI *aURI,
                 const char *aError,
                 char **aPrimary,
                 char **aSecondary,
                 char **aTertiary,
                 char **aLinkIntro)
{
    if (strcmp (aError, "protocolNotFound") == 0)
    {
        nsCAutoString scheme;
        aURI->GetScheme (scheme);

        /* Translators: %s is the name of a protocol, like "http" etc. */
        *aPrimary = g_strdup_printf (_("“%s” protocol is not supported."), scheme.get());
        /* FIXME: get the list of supported protocols from necko */
        *aSecondary = _("Supported protocols are “http”, “https”, “ftp”, “file”, “smb” "
                "and “sftp”.");
    }
    else if (strcmp (aError, "fileNotFound") == 0)
    {
        nsCAutoString path;
        aURI->GetPath (path);

        /* Translators: %s is the path and filename, for example "/home/user/test.html" */
        *aPrimary = g_markup_printf_escaped (_("File “%s” not found."), path.get());
        *aSecondary = _("Check the location of the file and try again.");
    }
    else if (strcmp (aError, "dnsNotFound") == 0)
    {
        nsCAutoString host;
        aURI->GetHost (host);

        /* Translators: %s is the hostname, like "www.example.com" */
        *aPrimary = g_markup_printf_escaped (_("“%s” could not be found."),
                             host.get());
        *aSecondary = _("Check that you are connected to the internet, and "
                "that the address is correct.");
        *aLinkIntro = _("If this page used to exist, you may find an archived version:");
    }
    else if (strcmp (aError, "connectionFailure") == 0)
    {
        nsCAutoString host;
        aURI->GetHost (host);

        /* Translators: %s is the hostname, like "www.example.com" */
        *aPrimary = g_markup_printf_escaped
                (_("“%s” refused the connection."),
                 host.get());
        *aSecondary = _("The server may be busy or you may have a "
                "network connection problem. Try again later.");
        *aLinkIntro = _("There may be an old version of the page you wanted:");
    }
    else if (strcmp (aError, "netInterrupt") == 0)
    {
        nsCAutoString host;
        aURI->GetHost (host);

        /* Translators: %s is the hostname, like "www.example.com" */
        *aPrimary = g_markup_printf_escaped
                (_("“%s” interrupted the connection."),
                 host.get());
        *aSecondary = _("The server may be busy or you may have a "
                "network connection problem. Try again later.");
        *aLinkIntro = _("There may be an old version of the page you wanted:");
    }
    else if (strcmp (aError, "netTimeout") == 0)
    {
        nsCAutoString host;
        aURI->GetHost (host);

        /* Translators: %s is the hostname, like "www.example.com" */
        *aPrimary = g_markup_printf_escaped
                (_("“%s” is not responding."),
                 host.get());
        *aSecondary = _("The connection was lost because the "
                "server took too long to respond.");
        *aTertiary = _("The server may be busy or you may have a network "
                    "connection problem. Try again later.");
        *aLinkIntro = _("There may be an old version of the page you wanted:");
    }
    else if (strcmp (aError, "malformedURI") == 0)
    {
        *aPrimary = g_strdup (_("Invalid address."));
        *aSecondary = g_strdup (_("The address you entered is not valid."));
    }
    else if (strcmp (aError, "redirectLoop") == 0)
    {
        nsCAutoString host;
        aURI->GetHost (host);

        /* Translators: %s is the hostname, like "www.example.com" */
        *aPrimary = g_markup_printf_escaped
                (_("“%s” redirected too many times."),
                 host.get());
        *aSecondary = _("The redirection has been stopped for security reasons.");
        *aLinkIntro = _("There may be an old version of the page you wanted:");
    }
    else if (strcmp (aError, "unknownSocketType") == 0)
    {
        nsCAutoString host;
        aURI->GetHost (host);

        /* Translators: %s is the hostname, like "www.example.com" */
        *aPrimary = g_markup_printf_escaped
                (_("“%s” requires an encrypted connection."),
                 host.get());
        *aSecondary = _("The document could not be loaded because "
                "encryption support is not installed.");
    }
    else if (strcmp (aError, "netReset") == 0)
    {
        nsCAutoString host;
        aURI->GetHost (host);

        /* Translators: %s is the hostname, like "www.example.com" */
        *aPrimary = g_markup_printf_escaped
                (_("“%s” dropped the connection."),
                 host.get());
        *aSecondary = _("The server dropped the connection "
                 "before any data could be read.");
        *aTertiary = _("The server may be busy or you may have a "
                   "network connection problem. Try again later.");
        *aLinkIntro = _("There may be an old version of the page you wanted:");
    }
    else if (strcmp (aError, "netOffline") == 0)
    {
        *aPrimary = g_strdup (_("Cannot load document in offline mode."));
        *aSecondary = _("This document cannot be viewed in offline "
                "mode. Set Epiphany to “online” "
                "and try again.");
    }
    else if (strcmp (aError, "deniedPortAccess") == 0)
    {
        nsCAutoString host;
        aURI->GetHost (host);

        PRInt32 port = -1;
        aURI->GetPort (&port);

        /* Translators: %s is the hostname, like "www.example.com" */
        *aPrimary = g_markup_printf_escaped
                (_("“%s” denied access to port “%d”."),
                 host.get(), port > 0 ? port : 80);
        *aSecondary = g_strdup (_("The server dropped the connection "
                      "before any data could be read."));
        *aTertiary = _("The server may be busy or you may have a "
                   "network connection problem. Try again later.");
        *aLinkIntro = _("There may be an old version of the page you wanted:");
    }
    else if (strcmp (aError, "proxyResolveFailure") == 0 ||
         strcmp (aError, "proxyConnectFailure") == 0)
    {
        *aPrimary = g_strdup (_("Could not connect to proxy server."));
        *aSecondary = _("Check the proxy server settings in Control Center. "
                "If the connection still fails, there may be "
                "a problem with your proxy server or your "
                "network connection.");
    }
    else
    {
        return NS_ERROR_ILLEGAL_VALUE;
    }

    return NS_OK;
}

nsresult
EphyAboutModule::CreateErrorPage(nsIURI *aErrorURI,
                 nsIChannel **_retval)
{
        /* First parse the arguments */
        nsresult rv = NS_ERROR_ILLEGAL_VALUE;
        nsCAutoString spec;
    rv = aErrorURI->GetSpec (spec);
    NS_ENSURE_TRUE (NS_SUCCEEDED (rv) && !spec.IsEmpty(), rv);

    nsCAutoString error, rawurl, url, charset;
    rv = ParseErrorURL (spec.get (), error, rawurl, url, charset);
    if (NS_FAILED (rv) || error.IsEmpty () || url.IsEmpty()) return rv;

    nsCOMPtr<nsIURI> uri;
    rv = EphyUtils::NewURI(getter_AddRefs (uri), url, charset.get());
    /* FIXME can uri be NULL if the original url was invalid? */
    NS_ENSURE_TRUE (NS_SUCCEEDED (rv) && uri, rv);

    char *primary = nsnull, *secondary = nsnull, *tertiary = nsnull, *linkintro = nsnull;
    rv = GetErrorMessage (uri, error.get(), &primary, &secondary, &tertiary, &linkintro);

    /* we don't know about this error code.
     * FIXME: We'd like to forward to mozilla's about:neterror handler,
     * but I don't know how to. So just redirect to the same page that
     * mozilla's handler redirects to.
     */
    if (rv == NS_ERROR_ILLEGAL_VALUE)
    {
        nsCAutoString url(spec);

        /* remove "about:neterror" part and insert mozilla's error page url */
        url.Cut(0, strlen ("about:neterror"));
        url.Insert("chrome://global/content/netError.xhtml", 0);

        return Redirect (url, _retval);
    }

    NS_ENSURE_TRUE (primary && secondary, NS_ERROR_FAILURE);

    /* open the rendering stream */
    nsCOMPtr<nsIStorageStream> storageStream;
    rv = NS_NewStorageStream(16384, (PRUint32) -1, getter_AddRefs (storageStream));
    NS_ENSURE_SUCCESS (rv, rv);

    nsCOMPtr<nsIOutputStream> stream;
    rv = storageStream->GetOutputStream(0, getter_AddRefs (stream));
    NS_ENSURE_SUCCESS (rv, rv);

    char *language = g_strdup (pango_language_to_string (gtk_get_default_language ()));
    g_strdelimit (language, "_-@", '\0');

    Write (stream,
           "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
           "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" "
           "\"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\n"
           "<html xmlns=\"http://www.w3.org/1999/xhtml\" lang=\"");
    Write (stream, language);
    Write (stream,
           "\" xml:lang=\"");
    Write (stream, language);
    Write (stream,
           "\">\n"
           "<head>\n"
        "<title>");
    Write (stream, primary);
    /* no favicon for now, it would pollute the favicon cache */
    /* "<link rel=\"icon\" type=\"image/png\" href=\"moz-icon://stock/gtk-dialog-error?size=16\" />\n" */
    Write (stream,
        "</title>\n"
        "<style type=\"text/css\">\n"
        "div#body {\n"
            "top: 12px;\n"
            "right: 12px;\n"
            "bottom: 12px;\n"
            "left: 12px;\n"
            "overflow: auto;\n"

            "background: -moz-dialog url('moz-icon://stock/gtk-dialog-error?size=dialog') no-repeat 12px 12px;\n"
            "color: -moz-dialogtext;\n"
            "font: message-box;\n"
            "border: 1px solid -moz-dialogtext;\n"

            "padding: 12px 12px 12px 72px;\n"
        "}\n"

        "h1 {\n"
            "margin: 0;\n"
            "font-size: 1.2em;\n"
        "}\n"
        "</style>\n"
           "</head>\n"
           "<body dir=\"");
    Write (stream,
           gtk_widget_get_default_direction () == GTK_TEXT_DIR_RTL ? "rtl" : "ltr");
    Write (stream,
           "\">\n"
        "<div id=\"body\">"
        "<h1>");
    Write (stream, primary);
    Write (stream,
           "</h1>\n"
           "<p>");
    Write (stream, secondary);
    if (tertiary)
    {
        Write (stream, " ");
        Write (stream, tertiary);
    }
    Write (stream,
        "</p>\n");

    PRBool isHttp = PR_FALSE, isHttps = PR_FALSE;
    uri->SchemeIs ("http", &isHttp);
    uri->SchemeIs ("https", &isHttps);
    if (linkintro && (isHttp || isHttps))
    {
        Write (stream, "<p>");
        Write (stream, linkintro);
        Write (stream, "<ul>\n");
        Write (stream, "<li><a href=\"http://www.google.com/search?q=cache:");
        Write (stream, rawurl.get());
        Write (stream, "\">");
        /* Translators: The text before the "|" is context to help you decide on
         * the correct translation. You MUST OMIT it in the translated string. */
        Write (stream, Q_("You may find an old version:|in the Google Cache"));
        Write (stream, "</a></li>\n");

        Write (stream, "<li><a href=\"http://web.archive.org/web/*/");
        Write (stream, rawurl.get());
        Write (stream, "\">");
        /* Translators: The text before the "|" is context to help you decide on
         * the correct translation. You MUST OMIT it in the translated string. */
        Write (stream, Q_("You may find an old version:|in the Internet Archive"));
        Write (stream, "</a></li>\n"
                   "</ul>\n"
                   "</p>");
    }

    Write (stream,
        "</div>\n"
           "</body>\n"
           "</html>\n");

    g_free (language);
    g_free (primary);
 
    /* finish the rendering */
    nsCOMPtr<nsIInputStream> inputStream;
    rv = storageStream->NewInputStream(0, getter_AddRefs (inputStream));
    NS_ENSURE_SUCCESS (rv, rv);

    nsCOMPtr<nsIInputStreamChannel> channel (do_CreateInstance ("@mozilla.org/network/input-stream-channel;1", &rv));
    NS_ENSURE_SUCCESS (rv, rv);

    rv |= channel->SetURI (aErrorURI);
    rv |= channel->SetContentStream (inputStream);
    rv |= channel->SetContentType (NS_LITERAL_CSTRING ("application/xhtml+xml"));
    rv |= channel->SetContentCharset (NS_LITERAL_CSTRING ("utf-8"));
    NS_ENSURE_SUCCESS (rv, rv);

    nsCOMPtr<nsIScriptSecurityManager> securityManager 
        (do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID, &rv));
    NS_ENSURE_SUCCESS (rv, rv);

    nsCOMPtr<nsIPrincipal> principal;
    rv = securityManager->GetCodebasePrincipal (aErrorURI, getter_AddRefs (principal));
    NS_ENSURE_SUCCESS (rv, rv);

    rv = channel->SetOwner(principal);
    NS_ENSURE_SUCCESS (rv, rv);

    NS_ADDREF(*_retval = channel);
    return rv;
}

nsresult
EphyAboutModule::Write(nsIOutputStream *aStream,
               const char *aText)
{
    PRUint32 bytesWritten;
    return aStream->Write (aText, strlen (aText), &bytesWritten);
}