path: root/modules/text-highlight/e-mail-formatter-text-highlight.c

/*
 * text-highlight.c
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "e-mail-formatter-text-highlight.h"
#include "languages.h"

#include <em-format/e-mail-formatter-extension.h>
#include <em-format/e-mail-formatter.h>
#include <em-format/e-mail-part-utils.h>
#include <e-util/e-util.h>

#include <shell/e-shell-settings.h>
#include <shell/e-shell.h>

#include <libebackend/libebackend.h>
#include <libedataserver/libedataserver.h>

#include <glib/gi18n-lib.h>
#include <X11/Xlib.h>
#include <camel/camel.h>

typedef struct _EMailFormatterTextHighlight EMailFormatterTextHighlight;
typedef struct _EMailFormatterTextHighlightClass EMailFormatterTextHighlightClass;

struct _EMailFormatterTextHighlight {
    EExtension parent;
};

struct _EMailFormatterTextHighlightClass {
    EExtensionClass parent_class;
};

GType e_mail_formatter_text_highlight_get_type (void);
static void e_mail_formatter_formatter_extension_interface_init (EMailFormatterExtensionInterface *iface);
static void e_mail_formatter_mail_extension_interface_init (EMailExtensionInterface *iface);

G_DEFINE_DYNAMIC_TYPE_EXTENDED (
    EMailFormatterTextHighlight,
    e_mail_formatter_text_highlight,
    E_TYPE_EXTENSION,
    0,
    G_IMPLEMENT_INTERFACE_DYNAMIC (
        E_TYPE_MAIL_EXTENSION,
        e_mail_formatter_mail_extension_interface_init)
    G_IMPLEMENT_INTERFACE_DYNAMIC (
        E_TYPE_MAIL_FORMATTER_EXTENSION,
        e_mail_formatter_formatter_extension_interface_init));

static gchar *
get_default_font (void)
{
    gchar *font;
    GSettings *settings;

    settings = g_settings_new ("org.gnome.desktop.interface");

    font = g_settings_get_string (settings, "monospace-font-name");

    g_object_unref (settings);

    return font ? font : g_strdup ("monospace 10");
}

static gchar *
get_syntax (EMailPart *part,
            const gchar *uri)
{
    gchar *syntax = NULL;
    CamelContentType *ct = NULL;

    if (uri) {
        SoupURI *soup_uri = soup_uri_new (uri);
        GHashTable *query = soup_form_decode (soup_uri->query);

        syntax = g_hash_table_lookup (query, "__formatas");
        if (syntax) {
            syntax = g_strdup (syntax);
        }
        g_hash_table_destroy (query);
        soup_uri_free (soup_uri);
    }

    /* Try to detect syntax by content-type first */
    if (syntax == NULL) {
        ct = camel_mime_part_get_content_type (part->part);
        if (ct) {
            gchar *mime_type = camel_content_type_simple (ct);

            syntax = (gchar *) get_syntax_for_mime_type (mime_type);
            syntax = syntax ? g_strdup (syntax) : NULL;
            g_free (mime_type);
        }
    }

    /* If it fails or the content type too generic, try to detect it by
     * filename extension */
    if (syntax == NULL || ct == NULL ||
        camel_content_type_is (ct, "application", "octet-stream") ||
        camel_content_type_is (ct, "text", "plain")) {
        const gchar *filename = camel_mime_part_get_filename (part->part);
        if (filename) {
            gchar *ext = g_strrstr (filename, ".");
            if (ext) {
                syntax = (gchar *) get_syntax_for_ext (ext + 1);
                syntax = syntax ? g_strdup (syntax) : NULL;
            }
        }
    }

    /* Out of ideas - use plain text */
    if (syntax == NULL) {
        syntax = g_strdup ("txt");
    }

    return syntax;
}

static gboolean
emfe_text_highlight_format (EMailFormatterExtension *extension,
                            EMailFormatter *formatter,
                            EMailFormatterContext *context,
                            EMailPart *part,
                            CamelStream *stream,
                            GCancellable *cancellable)
{
    /* Don't format text/html unless it's an attachment */
    CamelContentType *ct = camel_mime_part_get_content_type (part->part);
    if (ct && camel_content_type_is (ct, "text", "html")) {
        const CamelContentDisposition *disp;
        disp = camel_mime_part_get_content_disposition (part->part);

        if (!disp || g_strcmp0 (disp->disposition, "attachment") != 0)
            return FALSE;
    }

    if (context->mode == E_MAIL_FORMATTER_MODE_PRINTING) {

        CamelDataWrapper *dw;
        CamelStream *filter_stream;
        CamelMimeFilter *mime_filter;

        dw = camel_medium_get_content (CAMEL_MEDIUM (part->part));
        if (!dw) {
            return FALSE;
        }

        camel_stream_write_string (
            stream, "<pre><div class=\"pre\">", cancellable, NULL);

        filter_stream = camel_stream_filter_new (stream);
        mime_filter = camel_mime_filter_tohtml_new (
                CAMEL_MIME_FILTER_TOHTML_PRE |
                CAMEL_MIME_FILTER_TOHTML_CONVERT_SPACES, 0);
        camel_stream_filter_add (
            CAMEL_STREAM_FILTER (filter_stream), mime_filter);
        g_object_unref (mime_filter);

        e_mail_formatter_format_text (
            formatter, part, filter_stream, cancellable);

        camel_stream_flush (filter_stream, cancellable, NULL);
        g_object_unref (filter_stream);

        camel_stream_write_string (
            stream, "</div></pre>", cancellable, NULL);

        return TRUE;

    } else if (context->mode == E_MAIL_FORMATTER_MODE_RAW) {
        gint stdin, stdout;
        GPid pid;
        CamelStream *read, *write;
        CamelDataWrapper *dw;
        gchar *font_family, *font_size, *syntax;
        gboolean use_custom_font;
        EShell *shell;
        EShellSettings *settings;
        PangoFontDescription *fd;
        const gchar *argv[] = { "highlight",
                    NULL,   /* --font= */
                    NULL,   /* --font-size= */
                    NULL,   /* --syntax= */
                    "--out-format=html",
                    "--include-style",
                    "--inline-css",
                    "--style=bclear",
                    "--failsafe",
                    NULL };

        dw = camel_medium_get_content (CAMEL_MEDIUM (part->part));
        if (!dw) {
            return FALSE;
        }

        syntax = get_syntax (part, context->uri);

        /* Use the traditional text/plain formatter for plain-text */
        if (g_strcmp0 (syntax, "txt") == 0) {
            g_free (syntax);
            return FALSE;
        }

        shell = e_shell_get_default ();
        settings = e_shell_get_shell_settings (shell);

        fd = NULL;
        use_custom_font = e_shell_settings_get_boolean (
                    settings, "mail-use-custom-fonts");
        if (!use_custom_font) {
            gchar *font;

            font = get_default_font ();
            fd = pango_font_description_from_string (font);
            g_free (font);

        } else {
            gchar *font;

            font = e_shell_settings_get_string (
                    settings, "mail-font-monospace");
            if (!font)
                font = get_default_font ();

            fd = pango_font_description_from_string (font);
            g_free (font);
        }

        font_family = g_strdup_printf (
            "--font='%s'",
            pango_font_description_get_family (fd));
        font_size = g_strdup_printf (
            "--font-size=%d",
            pango_font_description_get_size (fd) / PANGO_SCALE);

        argv[1] = font_family;
        argv[2] = font_size;
        argv[3] = g_strdup_printf ("--syntax=%s", syntax);
        g_free (syntax);

        if (!g_spawn_async_with_pipes (
            NULL, (gchar **) argv, NULL,
            G_SPAWN_SEARCH_PATH |
            G_SPAWN_DO_NOT_REAP_CHILD,
            NULL, NULL, &pid, &stdin, &stdout, NULL, NULL)) {
            return FALSE;
        }

        write = camel_stream_fs_new_with_fd (stdin);
        read = camel_stream_fs_new_with_fd (stdout);

        camel_data_wrapper_decode_to_stream_sync (
            dw, write, cancellable, NULL);
        g_object_unref (write);

        g_spawn_close_pid (pid);

        g_seekable_seek (G_SEEKABLE (read), 0, G_SEEK_SET, cancellable, NULL);
        camel_stream_write_to_stream (read, stream, cancellable, NULL);
        g_object_unref (read);

        g_free (font_family);
        g_free (font_size);
        g_free ((gchar *) argv[3]);
        pango_font_description_free (fd);

    } else {
        gchar *uri, *str;
        gchar *syntax;

        syntax = get_syntax (part, NULL);

        uri = e_mail_part_build_uri (
            context->folder, context->message_uid,
            "part_id", G_TYPE_STRING, part->id,
            "mode", G_TYPE_INT, E_MAIL_FORMATTER_MODE_RAW,
            "__formatas", G_TYPE_STRING, syntax,
            NULL);

        g_free (syntax);

        str = g_strdup_printf (
            "<div class=\"part-container-nostyle\" >"
            "<iframe width=\"100%%\" height=\"10\""
            " id=\"%s\" name=\"%s\" "
            " frameborder=\"0\" src=\"%s\" "
            " style=\"border: 1px solid #%06x; background-color: #%06x;\">"
            "</iframe>"
            "</div>",
            part->id, part->id, uri,
            e_color_to_value ((GdkColor *)
                e_mail_formatter_get_color (
                    formatter, E_MAIL_FORMATTER_COLOR_FRAME)),
            e_color_to_value ((GdkColor *)
                e_mail_formatter_get_color (
                    formatter, E_MAIL_FORMATTER_COLOR_CONTENT)));

        camel_stream_write_string (stream, str, cancellable, NULL);

        g_free (str);
        g_free (uri);

    }

    return TRUE;
}

static const gchar *
emfe_text_highlight_get_display_name (EMailFormatterExtension *extension)
{
    return _("Text Highlight");
}

static const gchar *
emfe_text_highlight_get_description (EMailFormatterExtension *extension)
{
    return _("Syntax highlighting of mail parts");
}

static const gchar **
emfe_text_highlight_mime_types (EMailExtension *extension)
{
    return get_mime_types ();
}

static void
emfe_text_highlight_constructed (GObject *object)
{
    EExtensible *extensible;
    EMailExtensionRegistry *reg;

    extensible = e_extension_get_extensible (E_EXTENSION (object));
    reg = E_MAIL_EXTENSION_REGISTRY (extensible);

    e_mail_extension_registry_add_extension (reg, E_MAIL_EXTENSION (object));
}

static void
e_mail_formatter_text_highlight_init (EMailFormatterTextHighlight *object)
{
}

static void
e_mail_formatter_text_highlight_class_init (EMailFormatterTextHighlightClass *class)
{
    GObjectClass *object_class;
    EExtensionClass *extension_class;

    object_class = G_OBJECT_CLASS (class);
    object_class->constructed = emfe_text_highlight_constructed;

    extension_class = E_EXTENSION_CLASS (class);
    extension_class->extensible_type = E_TYPE_MAIL_FORMATTER_EXTENSION_REGISTRY;
}

static void
e_mail_formatter_text_highlight_class_finalize (EMailFormatterTextHighlightClass *class)
{
}

void
e_mail_formatter_text_highlight_type_register (GTypeModule *type_module)
{
    e_mail_formatter_text_highlight_register_type (type_module);
}

static void
e_mail_formatter_formatter_extension_interface_init (EMailFormatterExtensionInterface *iface)
{
    iface->format = emfe_text_highlight_format;
    iface->get_display_name = emfe_text_highlight_get_display_name;
    iface->get_description = emfe_text_highlight_get_description;
}

static void
e_mail_formatter_mail_extension_interface_init (EMailExtensionInterface *iface)
{
    iface->mime_types = emfe_text_highlight_mime_types;
}