Initial commit after cloneHEADmaster

1 files changed, 435 insertions, 0 deletions

diff --git a/src/config.c b/src/config.c
new file mode 100644
index 0000000..0d7b21b
--- /dev/null
+++ b/src/config.c
@@ -0,0 +1,435 @@
+/* Functions related to the Configuration */
+#include <stdlib.h>
+#include <string.h>
+
+#include <gdk/gdk.h>
+#include <glib.h>
+
+#include "config.h"
+#include "utils.h"
+
+
+static gchar *parse_greeter_string(GKeyFile *keyfile, const char *group_name,
+                                   const char *key_name, const gchar *fallback);
+static gint parse_greeter_integer(GKeyFile *keyfile, const char *group_name,
+                                  const char *key_name, const gint fallback);
+static gboolean parse_greeter_boolean(GKeyFile *keyfile, const char *group_name,
+                                      const char *key_name, const gboolean fallback);
+static GdkRGBA *parse_greeter_color_key(GKeyFile *keyfile, const char *key_name, const char *default_str);
+static guint parse_greeter_hotkey_keyval(GKeyFile *keyfile, const char *key_name, const char default_char);
+static gunichar *parse_greeter_password_char(GKeyFile *keyfile);
+static gfloat parse_greeter_password_alignment(GKeyFile *keyfile);
+static gboolean is_rtl_keymap_layout(void);
+gboolean input_string_equals(gchar *input_str, const gchar * const fixed_str);
+
+/* Initialize the configuration, sourcing the greeter's configuration file */
+Config *initialize_config(void)
+{
+    Config *config = malloc(sizeof(Config));
+    if (config == NULL) {
+        g_error("Could not allocate memory for Config");
+    }
+
+    // Load the key-value file
+    GKeyFile *keyfile = g_key_file_new();
+    GError *keyerror = NULL;
+    gboolean keyfile_loaded = g_key_file_load_from_file(
+        keyfile, CONFIG_FILE, G_KEY_FILE_NONE, &keyerror);
+    if (!keyfile_loaded) {
+        if (keyerror != NULL) {
+            g_error("Could not load configuration file: %s", keyerror->message);
+            free(keyerror);
+        } else {
+            g_error("Could not load configuration file.");
+        }
+    }
+
+    // Parse values from the keyfile into a Config.
+    config->login_user =
+        g_strchomp(g_key_file_get_string(keyfile, "greeter", "user", NULL));
+    if (strcmp(config->login_user, "CHANGE_ME") == 0) {
+        g_message("User configuration value is unchanged.");
+    }
+    config->show_password_label =
+        parse_greeter_boolean(keyfile, "greeter", "show-password-label", TRUE);
+    config->password_label_text = parse_greeter_string(
+        keyfile, "greeter", "password-label-text", "Password:");
+    config->invalid_password_text = parse_greeter_string(
+        keyfile, "greeter", "invalid-password-text", "Invalid Password");
+    config->show_input_cursor =
+        parse_greeter_boolean(keyfile, "greeter", "show-input-cursor", TRUE);
+    config->password_alignment = parse_greeter_password_alignment(keyfile);
+    config->password_input_width = parse_greeter_integer(
+        keyfile, "greeter", "password-input-width", -1);
+    config->show_image_on_all_monitors = parse_greeter_boolean(
+        keyfile, "greeter", "show-image-on-all-monitors", FALSE);
+    config->show_sys_info = parse_greeter_boolean(
+        keyfile, "greeter", "show-sys-info", FALSE);
+
+    // Parse Hotkey Settings
+    config->suspend_key = parse_greeter_hotkey_keyval(keyfile, "suspend-key", 'u');
+    config->hibernate_key = parse_greeter_hotkey_keyval(keyfile, "hibernate-key", 'h');
+    config->restart_key = parse_greeter_hotkey_keyval(keyfile, "restart-key", 'r');
+    config->shutdown_key = parse_greeter_hotkey_keyval(keyfile, "shutdown-key", 's');
+    config->session_key = parse_greeter_hotkey_keyval(keyfile, "session-key", 'e');
+    gchar *mod_key =
+        g_key_file_get_string(keyfile, "greeter-hotkeys", "mod-key", NULL);
+    if (mod_key == NULL) {
+        config->mod_bit = GDK_SUPER_MASK;
+    } else {
+        g_strchomp(mod_key);
+        if (strcmp(mod_key, "control") == 0) {
+            config->mod_bit = GDK_CONTROL_MASK;
+        } else if (strcmp(mod_key, "alt") == 0) {
+            config->mod_bit = GDK_MOD1_MASK;
+        } else if (strcmp(mod_key, "meta") == 0) {
+            config->mod_bit = GDK_SUPER_MASK;
+        } else {
+            g_error("Invalid mod-key configuration value: '%s'\n", mod_key);
+        }
+    }
+
+    // Parse Theme Settings
+    // Font
+    config->font =
+        parse_greeter_string(keyfile, "greeter-theme", "font", "Sans");
+    config->font_size =
+        parse_greeter_string(keyfile, "greeter-theme", "font-size", "1em");
+    config->font_weight =
+        parse_greeter_string(keyfile, "greeter-theme", "font-weight", "bold");
+    config->font_style =
+        parse_greeter_string(keyfile, "greeter-theme", "font-style", "normal");
+    config->text_color =
+        parse_greeter_color_key(keyfile, "text-color", "#080800");
+    config->error_color =
+        parse_greeter_color_key(keyfile, "error-color", "#F8F8F0");
+    // Background
+    config->background_image =
+        g_key_file_get_string(keyfile, "greeter-theme", "background-image", NULL);
+    if (config->background_image == NULL || strcmp(config->background_image, "") == 0) {
+        config->background_image = (gchar *) "\"\"";
+    }
+    config->background_color =
+        parse_greeter_color_key(keyfile, "background-color", "#1B1D1E");
+    config->background_image_size =
+        parse_greeter_string(keyfile, "greeter-theme", "background-image-size", "auto");
+    // Window
+    config->window_color =
+        parse_greeter_color_key(keyfile, "window-color", "#F92672");
+    config->border_color =
+        parse_greeter_color_key(keyfile, "border-color", "#080800");
+    config->border_width = parse_greeter_string(
+        keyfile, "greeter-theme", "border-width", "2px");
+    // Password
+    config->password_char =
+        parse_greeter_password_char(keyfile);
+    config->password_color =
+        parse_greeter_color_key(keyfile, "password-color", "#F8F8F0");
+    config->password_background_color =
+        parse_greeter_color_key(keyfile, "password-background-color", "#1B1D1E");
+    gchar *temp_password_border_color = g_key_file_get_string(
+        keyfile, "greeter-theme", "password-border-color", NULL);
+    if (temp_password_border_color == NULL) {
+        config->password_border_color = config->border_color;
+    } else {
+        free(temp_password_border_color);
+        config->password_border_color =
+            parse_greeter_color_key(keyfile, "password-border-color", "#080800");
+    }
+    config->password_border_width = parse_greeter_string(
+        keyfile, "greeter-theme", "password-border-width", config->border_width);
+    config->password_border_radius = parse_greeter_string(
+        keyfile, "greeter-theme", "password-border-radius", "0.341125em");
+    // System Info
+    gchar *temp_sys_info_color = g_key_file_get_string(
+        keyfile, "greeter-theme", "sys-info-color", NULL);
+    if (temp_sys_info_color == NULL) {
+        config->sys_info_color = config->text_color;
+    } else {
+        config->sys_info_color = parse_greeter_color_key(
+            keyfile, "sys-info-color", "#080800");
+    }
+    config->sys_info_font = parse_greeter_string(keyfile, "greeter-theme", "sys-info-font", config->font);
+    config->sys_info_font_size =
+        parse_greeter_string(keyfile, "greeter-theme", "sys-info-font-size", config->font_size);
+    config->sys_info_margin =
+        parse_greeter_string(keyfile, "greeter-theme", "sys-info-margin", "-5px -5px -5px");
+
+
+    gint layout_spacing =
+        parse_greeter_integer(keyfile, "greeter-theme", "layout-space", 15);
+    if (layout_spacing < 0) {
+        config->layout_spacing = (guint) (-1 * layout_spacing);
+    } else {
+        config->layout_spacing = (guint) layout_spacing;
+    }
+
+    config->x_pos = g_key_file_get_double(keyfile, "greeter-theme", "x-pos", NULL);
+    config->y_pos = g_key_file_get_double(keyfile, "greeter-theme", "y-pos", NULL);
+
+    g_key_file_free(keyfile);
+
+    return config;
+}
+
+
+/* Cleanup any memory allocated for the Config */
+void destroy_config(Config *config)
+{
+    free(config->login_user);
+    free(config->font);
+    free(config->font_size);
+    free(config->font_weight);
+    free(config->font_style);
+    free(config->text_color);
+    free(config->error_color);
+    free(config->background_image);
+    free(config->background_color);
+    free(config->background_image_size);
+    free(config->window_color);
+    free(config->border_color);
+    free(config->border_width);
+    free(config->password_label_text);
+    free(config->invalid_password_text);
+    free(config->password_char);
+    free(config->password_color);
+    free(config->password_background_color);
+    free(config->password_border_color);
+    free(config->password_border_width);
+    free(config->password_border_radius);
+    free(config->sys_info_color);
+    free(config->sys_info_font_size);
+    free(config->sys_info_margin);
+    free(config);
+}
+
+
+/* Parse a string from the config file, returning a copy of the fallback value
+ * if the key is not present in the group.
+ */
+static gchar *parse_greeter_string(GKeyFile *keyfile, const char *group_name,
+                                   const char *key_name, const gchar *fallback)
+{
+    gchar *parsed_string = g_key_file_get_string(keyfile, group_name, key_name, NULL);
+    if (parsed_string == NULL) {
+        g_warning("Could not find value for %s.%s - falling back to '%s'",
+                  group_name, key_name, fallback);
+        return g_strdup(fallback);
+    } else {
+        return parsed_string;
+    }
+}
+
+/* Parse an integer from the config file, returning the fallback value if the
+ * key is not present in the group, or if the value is not an integer.
+ */
+static gint parse_greeter_integer(GKeyFile *keyfile, const char *group_name,
+                                  const char *key_name, const gint fallback)
+{
+    GError *parse_error = NULL;
+    gint parse_result = g_key_file_get_integer(
+        keyfile, group_name, key_name, &parse_error);
+    if (parse_error != NULL) {
+        if (parse_error->code == G_KEY_FILE_ERROR_INVALID_VALUE) {
+            // Read the value as a string so we can log it
+            gchar *value = g_key_file_get_string(
+                keyfile, group_name, key_name, NULL);
+            g_warning("Invalid integer for %s.%s: `%s`",
+                      group_name, key_name, value);
+            free(value);
+        }
+        g_error_free(parse_error);
+        return fallback;
+    }
+    return parse_result;
+}
+
+/* Parse a boolean from the config file, returning the fallback value if the
+ * key is not present in the group or cannot be parsed as a boolean.
+ */
+static gboolean parse_greeter_boolean(GKeyFile *keyfile, const char *group_name,
+                                      const char *key_name, const gboolean fallback)
+{
+    GError *parse_error = NULL;
+    gboolean parse_result = g_key_file_get_boolean(
+        keyfile, group_name, key_name, &parse_error);
+    if (!parse_result && parse_error != NULL) {
+        if (parse_error->code == G_KEY_FILE_ERROR_INVALID_VALUE) {
+            // Read the value as a string so we can log it
+            gchar *value = g_key_file_get_string(
+                keyfile, group_name, key_name, NULL);
+            g_warning("Invalid boolean for %s.%s: `%s`\n",
+                      group_name, key_name, value);
+            g_free(value);
+        }
+        g_error_free(parse_error);
+        return fallback;
+    }
+    return parse_result;
+}
+
+/* Parse a greeter-colors group key into a newly-allocated GdkRGBA value */
+static GdkRGBA *parse_greeter_color_key(GKeyFile *keyfile, const char *key_name, const char *default_str)
+{
+    gchar *color_string = g_key_file_get_string(
+        keyfile, "greeter-theme", key_name, NULL);
+    if (color_string == NULL) {
+        g_warning("Could not find value for %s.%s - falling back to '%s'",
+                  "greeter-theme", key_name, default_str);
+    }
+
+    GdkRGBA *default_color = malloc(sizeof(GdkRGBA));
+    gboolean default_was_parsed = gdk_rgba_parse(default_color, default_str);
+    if (!default_was_parsed) {
+        g_critical("Could not parse the default '%s' setting: %s", key_name, default_str);
+    }
+
+    if (color_string != NULL) {
+        if (strstr(color_string, "#") != NULL) {
+            // Remove quotations from hex color strings
+            remove_char(color_string, '"');
+            remove_char(color_string, '\'');
+        }
+
+        GdkRGBA *color = malloc(sizeof(GdkRGBA));
+        gboolean color_was_parsed = gdk_rgba_parse(color, color_string);
+        if (color_was_parsed) {
+            free(default_color);
+            return color;
+        }
+        g_warning("Could not parse the '%s' setting: %s - falling back to default of %s",
+                    key_name, color_string, default_str);
+        free(color);
+    }
+    return default_color;
+}
+
+/* Parse a greeter-hotkeys key into the GDKkeyval of it's first character */
+static guint parse_greeter_hotkey_keyval(GKeyFile *keyfile, const char *key_name, const char default_char)
+{
+    gchar *key = g_key_file_get_string(
+        keyfile, "greeter-hotkeys", key_name, NULL);
+
+    guint32 key_code;
+    if (key == NULL) {
+        key_code = (guint32) default_char;
+    } else if (strcmp(key, "") == 0) {
+        g_warning("Configuration contains empty key for '%s' - falling back to default of %c\n", key_name, default_char);
+        key_code = (guint32) default_char;
+    } else {
+        key_code = (guint32) key[0];
+    }
+
+    return gdk_unicode_to_keyval(key_code);
+}
+
+/* Parse the password masking character that should be displayed when typing
+ * into the password input.
+ *
+ * We first attempt to parse a literal -1 or 0, where -1 means to use the
+ * default character & 0 means to display no characters when typing a password.
+ *
+ * If that parsing fails, we attempt to parse the field as a string & use the
+ * first character of the string. If the string is empty or parsing fails, we
+ * fall back to the default characer.
+ *
+ * Since the related gtk_entry function takes a unsigned int, we use pointers,
+ * where NULL means "use the default" & all other values indicate an argument
+ * to the `gtk_entry_set_invisible_char` function.
+ *
+ */
+static gunichar *parse_greeter_password_char(GKeyFile *keyfile)
+{
+    const char *const group_name = "greeter-theme";
+    const char *const key_name = "password-character";
+    GError *parse_error = NULL;
+
+    // Attempt the int parsing
+
+    const gint int_result = g_key_file_get_integer(
+        keyfile, group_name, key_name, &parse_error);
+    // Matches -1
+    if (int_result == -1) {
+        return NULL;
+    }
+
+    gunichar *result = malloc(sizeof(gunichar));
+    // Matches 0
+    if (int_result == 0 && parse_error == NULL) {
+        *result = 0;
+        return result;
+    } else if (parse_error != NULL) {
+        g_error_free(parse_error);
+    }
+
+    // Atempt the string parsing
+
+    gchar *str_result = g_key_file_get_string(
+        keyfile, group_name, key_name, NULL);
+
+    // Invalid or 0-length string
+    if (str_result == NULL || strlen(str_result) == 0) {
+        if (str_result != NULL) {
+            free(str_result);
+        }
+        free(result);
+        return NULL;
+    }
+
+    // Convert to unicode code points
+    gunichar *unicode_str = g_utf8_to_ucs4(str_result, -1, NULL, NULL, NULL);
+    free(str_result);
+
+    if (unicode_str == NULL) {
+        free(result);
+        return NULL;
+    }
+
+    *result = unicode_str[0];
+    g_free(unicode_str);
+    return result;
+}
+
+/* Parse the password input alignment, properly handling RTL layouts.
+ *
+ * Note that the gboolean returned by this function is meant to be used with
+ * the `gtk_entry_set_alignment` function.
+ */
+static gfloat parse_greeter_password_alignment(GKeyFile *keyfile)
+{
+    gfloat alignment;
+
+    gchar *password_alignment_text = parse_greeter_string(
+        keyfile, "greeter", "password-alignment", "right");
+    gboolean is_rtl = is_rtl_keymap_layout();
+
+    if (input_string_equals(password_alignment_text, "left")) {
+        alignment = is_rtl ? 1 : 0;
+    } else if (input_string_equals(password_alignment_text, "center")) {
+        alignment = 0.5;
+    } else {
+        alignment = is_rtl ? 0 : 1;
+    }
+    free(password_alignment_text);
+    return alignment;
+}
+
+/* Determine if the default Display's Keymap is in the Right-to-Left direction
+ */
+static gboolean is_rtl_keymap_layout(void)
+{
+    GdkDisplay *display = gdk_display_get_default();
+    if (display == NULL) {
+        return FALSE;
+    }
+    GdkKeymap *keymap = gdk_keymap_get_for_display(display);
+    PangoDirection text_direction = gdk_keymap_get_direction(keymap);
+    return text_direction == PANGO_DIRECTION_RTL;
+}
+
+/* Take a string from the config file, trim any whitespace & check it's
+ * equality with a fixed string.
+ */
+gboolean input_string_equals(gchar *input_str, const gchar * const fixed_str) {
+    return strcmp(g_strchomp(input_str), fixed_str) == 0;
+}