path: root/mail/e-mail-request.c

/*
 * e-mail-request.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.
 *
 * 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 Lesser General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#define LIBSOUP_USE_UNSTABLE_REQUEST_API

#include "e-mail-request.h"
#include "em-utils.h"

#include <libsoup/soup.h>
#include <libsoup/soup-requester.h>
#include <libsoup/soup-request-http.h>

#include <webkit/webkit.h>

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

#include "shell/e-shell.h"

#include "em-format/e-mail-formatter.h"
#include "em-format/e-mail-formatter-utils.h"
#include "em-format/e-mail-formatter-print.h"

#include "e-mail-ui-session.h"

#define d(x)
#define dd(x)

#define E_MAIL_REQUEST_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_MAIL_REQUEST, EMailRequestPrivate))

struct _EMailRequestPrivate {
    GBytes *bytes;
    gchar *mime_type;

    GHashTable *uri_query;
    gchar *uri_base;
    gchar *full_uri;

    gchar *ret_mime_type;
};

static const gchar *data_schemes[] = { "mail", NULL };

G_DEFINE_TYPE (EMailRequest, e_mail_request, SOUP_TYPE_REQUEST)

static void
handle_mail_request (GSimpleAsyncResult *simple,
                     GObject *object,
                     GCancellable *cancellable)
{
    EMailRequest *request = E_MAIL_REQUEST (object);
    GInputStream *stream;
    EMailFormatter *formatter;
    EMailPartList *part_list;
    CamelObjectBag *registry;
    CamelStream *output_stream;
    GByteArray *byte_array;
    const gchar *val;
    const gchar *default_charset, *charset;

    EMailFormatterContext context = { 0 };

    if (g_cancellable_is_cancelled (cancellable))
        return;

    registry = e_mail_part_list_get_registry ();
    part_list = camel_object_bag_get (registry, request->priv->uri_base);

    if (camel_debug_start ("emformat:requests")) {
        printf ("%s: found part-list %p for full_uri '%s'\n", G_STRFUNC, part_list, request->priv->full_uri);
        camel_debug_end ();
    }

    if (!part_list)
        return;

    val = g_hash_table_lookup (
        request->priv->uri_query, "headers_collapsed");
    if (val != NULL && atoi (val) == 1)
        context.flags |= E_MAIL_FORMATTER_HEADER_FLAG_COLLAPSED;

    val = g_hash_table_lookup (
        request->priv->uri_query, "headers_collapsable");
    if (val != NULL && atoi (val) == 1)
        context.flags |= E_MAIL_FORMATTER_HEADER_FLAG_COLLAPSABLE;

    val = g_hash_table_lookup (request->priv->uri_query, "mode");
    if (val != NULL)
        context.mode = atoi (val);

    default_charset = g_hash_table_lookup (
        request->priv->uri_query, "formatter_default_charset");
    charset = g_hash_table_lookup (
        request->priv->uri_query, "formatter_charset");

    context.part_list = g_object_ref (part_list);
    context.uri = request->priv->full_uri;

    if (context.mode == E_MAIL_FORMATTER_MODE_PRINTING)
        formatter = e_mail_formatter_print_new ();
    else
        formatter = e_mail_formatter_new ();

    if (default_charset != NULL && *default_charset != '\0')
        e_mail_formatter_set_default_charset (formatter, default_charset);
    if (charset != NULL && *charset != '\0')
        e_mail_formatter_set_charset (formatter, charset);

    byte_array = g_byte_array_new ();
    output_stream = camel_stream_mem_new ();

    /* We retain ownership of the byte array. */
    camel_stream_mem_set_byte_array (
        CAMEL_STREAM_MEM (output_stream), byte_array);

    val = g_hash_table_lookup (request->priv->uri_query, "part_id");
    if (val != NULL) {
        EMailPart *part;
        const gchar *mime_type;
        gchar *part_id;

        part_id = soup_uri_decode (val);
        part = e_mail_part_list_ref_part (part_list, part_id);
        if (!part) {
            if (camel_debug_start ("emformat:requests")) {
                printf ("%s: part with id '%s' not found\n", G_STRFUNC, part_id);
                camel_debug_end ();
            }

            g_free (part_id);
            goto no_part;
        }
        g_free (part_id);

        mime_type = g_hash_table_lookup (
            request->priv->uri_query, "mime_type");

        if (context.mode == E_MAIL_FORMATTER_MODE_SOURCE)
            mime_type = "application/vnd.evolution.source";

        if (context.mode == E_MAIL_FORMATTER_MODE_CID) {
            CamelDataWrapper *dw;
            CamelMimePart *mime_part;

            mime_part = e_mail_part_ref_mime_part (part);
            dw = camel_medium_get_content (CAMEL_MEDIUM (mime_part));
            g_return_if_fail (dw);

            camel_data_wrapper_decode_to_stream_sync (
                dw, output_stream, cancellable, NULL);

            g_object_unref (mime_part);
        } else {
            if (mime_type == NULL)
                mime_type = e_mail_part_get_mime_type (part);

            e_mail_formatter_format_as (
                formatter, &context, part,
                output_stream, mime_type,
                cancellable);
        }

        g_object_unref (part);

    } else {
        e_mail_formatter_format_sync (
            formatter, part_list, output_stream,
            context.flags, context.mode, cancellable);
    }

 no_part:
    g_clear_object (&output_stream);
    g_clear_object (&context.part_list);

    if (byte_array->data == NULL) {
        gchar *data;

        data = g_strdup_printf (
            "<p align='center'>%s</p>",
            _("The message has no text content."));
        g_byte_array_append (
            byte_array, (guint8 *) data, strlen (data));
        g_free (data);
    }

    if (request->priv->bytes != NULL)
        g_bytes_unref (request->priv->bytes);
    request->priv->bytes = g_byte_array_free_to_bytes (byte_array);

    stream = g_memory_input_stream_new_from_bytes (request->priv->bytes);

    g_simple_async_result_set_op_res_gpointer (
        simple, g_object_ref (stream),
        (GDestroyNotify) g_object_unref);

    g_object_unref (stream);

    g_object_unref (part_list);
    g_object_unref (formatter);
}

static GInputStream *
get_empty_image_stream (void)
{
    GdkPixbuf *pixbuf;
    gchar *buffer;
    gsize length;

    pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, 1, 1);
    gdk_pixbuf_fill (pixbuf, 0x00000000); /* transparent black */
    gdk_pixbuf_save_to_buffer (pixbuf, &buffer, &length, "png", NULL, NULL);
    g_object_unref (pixbuf);

    return g_memory_input_stream_new_from_data (buffer, length, g_free);
}

static void
handle_contact_photo_request (GSimpleAsyncResult *simple,
                              GObject *object,
                              GCancellable *cancellable)
{
    EMailRequest *request = E_MAIL_REQUEST (object);
    EShell *shell;
    EShellBackend *shell_backend;
    EMailBackend *mail_backend;
    EMailSession *mail_session;
    EPhotoCache *photo_cache;
    CamelInternetAddress *cia;
    GInputStream *stream = NULL;
    const gchar *email_address;
    const gchar *escaped_string;
    gchar *unescaped_string;
    GError *error = NULL;

    /* XXX Is this really the only way to obtain
     *     the mail session instance from here? */
    shell = e_shell_get_default ();
    shell_backend = e_shell_get_backend_by_name (shell, "mail");
    mail_backend = E_MAIL_BACKEND (shell_backend);
    mail_session = e_mail_backend_get_session (mail_backend);

    photo_cache = e_mail_ui_session_get_photo_cache (
        E_MAIL_UI_SESSION (mail_session));

    request->priv->mime_type = g_strdup ("image/*");

    escaped_string = g_hash_table_lookup (
        request->priv->uri_query, "mailaddr");
    if (escaped_string == NULL || *escaped_string == '\0')
        goto exit;

    cia = camel_internet_address_new ();

    unescaped_string = g_uri_unescape_string (escaped_string, NULL);
    camel_address_decode (CAMEL_ADDRESS (cia), unescaped_string);
    g_free (unescaped_string);

    if (camel_internet_address_get (cia, 0, NULL, &email_address))
        e_photo_cache_get_photo_sync (
            photo_cache, email_address,
            cancellable, &stream, &error);

    g_object_unref (cia);

    /* Ignore cancellations. */
    if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
        g_clear_error (&error);
    } else if (error != NULL) {
        g_warning ("%s: %s", G_STRFUNC, error->message);
        g_clear_error (&error);
    }

exit:
    if (stream == NULL)
        stream = get_empty_image_stream ();

    g_simple_async_result_set_op_res_gpointer (
        simple, g_object_ref (stream),
        (GDestroyNotify) g_object_unref);

    g_object_unref (stream);
}

static void
mail_request_finalize (GObject *object)
{
    EMailRequestPrivate *priv;

    priv = E_MAIL_REQUEST_GET_PRIVATE (object);

    if (priv->bytes != NULL)
        g_bytes_unref (priv->bytes);

    if (priv->uri_query != NULL)
        g_hash_table_destroy (priv->uri_query);

    g_free (priv->mime_type);
    g_free (priv->uri_base);
    g_free (priv->full_uri);
    g_free (priv->ret_mime_type);

    /* Chain up to parent's finalize() method. */
    G_OBJECT_CLASS (e_mail_request_parent_class)->finalize (object);
}

static gboolean
mail_request_check_uri (SoupRequest *request,
                       SoupURI *uri,
                       GError **error)
{
    return (strcmp (uri->scheme, "mail") == 0);
}

static void
mail_request_send_async (SoupRequest *request,
                         GCancellable *cancellable,
                         GAsyncReadyCallback callback,
                         gpointer user_data)
{
    EMailRequestPrivate *priv;
    GSimpleAsyncResult *simple;
    SoupURI *uri;

    priv = E_MAIL_REQUEST_GET_PRIVATE (request);

    uri = soup_request_get_uri (request);

    d (printf ("received request for %s\n", soup_uri_to_string (uri, FALSE)));

    if (uri->query) {
        priv->uri_query = soup_form_decode (uri->query);
    } else {
        priv->uri_query = NULL;
    }

    priv->full_uri = soup_uri_to_string (uri, FALSE);
    priv->uri_base = g_strdup_printf (
        "%s://%s%s", uri->scheme, uri->host, uri->path);

    simple = g_simple_async_result_new (
        G_OBJECT (request), callback,
        user_data, mail_request_send_async);

    g_simple_async_result_set_check_cancellable (simple, cancellable);

    if (g_strcmp0 (uri->host, "contact-photo") == 0) {
        g_simple_async_result_run_in_thread (
            simple, handle_contact_photo_request,
            G_PRIORITY_DEFAULT, cancellable);
    } else {
        g_simple_async_result_run_in_thread (
            simple, handle_mail_request,
            G_PRIORITY_DEFAULT, cancellable);
    }

    g_object_unref (simple);
}

static GInputStream *
mail_request_send_finish (SoupRequest *request,
                          GAsyncResult *result,
                          GError **error)
{
    GSimpleAsyncResult *simple;
    GInputStream *stream;

    simple = G_SIMPLE_ASYNC_RESULT (result);
    stream = g_simple_async_result_get_op_res_gpointer (simple);

    /* Reset the stream before passing it back to webkit */
    if (G_IS_SEEKABLE (stream))
        g_seekable_seek (
            G_SEEKABLE (stream), 0, G_SEEK_SET, NULL, NULL);

    if (stream == NULL) {
        /* We must always return something */
        stream = g_memory_input_stream_new ();
    } else {
        g_object_ref (stream);
    }

    return stream;
}

static goffset
mail_request_get_content_length (SoupRequest *request)
{
    EMailRequestPrivate *priv;
    goffset content_length = -1;  /* -1 means unknown */

    priv = E_MAIL_REQUEST_GET_PRIVATE (request);

    if (priv->bytes != NULL)
        content_length = g_bytes_get_size (priv->bytes);

    return content_length;
}

static const gchar *
mail_request_get_content_type (SoupRequest *request)
{
    EMailRequestPrivate *priv;
    gchar *mime_type;

    priv = E_MAIL_REQUEST_GET_PRIVATE (request);

    if (priv->mime_type != NULL) {
        mime_type = g_strdup (priv->mime_type);
    } else {
        mime_type = g_strdup ("text/html");
    }

    if (g_strcmp0 (mime_type, "text/html") == 0) {
        priv->ret_mime_type = g_strconcat (
            mime_type, "; charset=\"UTF-8\"", NULL);
        g_free (mime_type);
    } else {
        priv->ret_mime_type = mime_type;
    }

    d (printf ("Content-Type: %s\n", priv->ret_mime_type));

    return priv->ret_mime_type;
}

static void
e_mail_request_class_init (EMailRequestClass *class)
{
    GObjectClass *object_class;
    SoupRequestClass *request_class;

    g_type_class_add_private (class, sizeof (EMailRequestPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->finalize = mail_request_finalize;

    request_class = SOUP_REQUEST_CLASS (class);
    request_class->schemes = data_schemes;
    request_class->send_async = mail_request_send_async;
    request_class->send_finish = mail_request_send_finish;
    request_class->get_content_type = mail_request_get_content_type;
    request_class->get_content_length = mail_request_get_content_length;
    request_class->check_uri = mail_request_check_uri;
}

static void
e_mail_request_init (EMailRequest *request)
{
    request->priv = E_MAIL_REQUEST_GET_PRIVATE (request);
}