gl: Add signing UI for Digital Signatures.

All the "Sign" button does for now is recreate the appearance stream.

1 files changed, 158 insertions, 0 deletions

diff --git a/platform/gl/gl-form.c b/platform/gl/gl-form.c
new file mode 100644
index 00000000..f9083f71
--- /dev/null
+++ b/platform/gl/gl-form.c
@@ -0,0 +1,158 @@
+#include "gl-app.h"
+
+#include <string.h>
+#include <stdio.h>
+
+#ifndef PATH_MAX
+#define PATH_MAX 2048
+#endif
+
+#include "mupdf/helpers/pkcs7-check.h"
+#include "mupdf/helpers/pkcs7-openssl.h"
+
+static char cert_filename[PATH_MAX];
+static struct input cert_password;
+
+static void do_sign(void)
+{
+	pdf_pkcs7_signer *signer = NULL;
+
+	fz_var(signer);
+
+	fz_try(ctx)
+	{
+		signer = pkcs7_openssl_read_pfx(ctx, cert_filename, cert_password.text);
+		pdf_sign_signature(ctx, pdf, selected_annot, signer);
+		ui_show_warning_dialog("Signed document successfully.");
+	}
+	fz_always(ctx)
+	{
+		if (signer)
+			signer->drop(signer);
+	}
+	fz_catch(ctx)
+		ui_show_warning_dialog("%s", fz_caught_message(ctx));
+
+	if (pdf_update_page(ctx, selected_annot->page))
+		render_page();
+}
+
+static void cert_password_dialog(void)
+{
+	int is;
+	ui_dialog_begin(400, (ui.gridsize+4)*3);
+	{
+		ui_layout(T, X, NW, 2, 2);
+		ui_label("Password:");
+		is = ui_input(&cert_password, 200, 1);
+
+		ui_layout(B, X, NW, 2, 2);
+		ui_panel_begin(0, ui.gridsize, 0, 0, 0);
+		{
+			ui_layout(R, NONE, S, 0, 0);
+			if (ui_button("Cancel"))
+				ui.dialog = NULL;
+			ui_spacer();
+			if (ui_button("Okay") || is == UI_INPUT_ACCEPT)
+			{
+				ui.dialog = NULL;
+				do_sign();
+			}
+		}
+		ui_panel_end();
+	}
+	ui_dialog_end();
+}
+
+static int cert_file_filter(const char *fn)
+{
+	return !!strstr(fn, ".pfx");
+}
+
+static void cert_file_dialog(void)
+{
+	if (ui_open_file(cert_filename))
+	{
+		if (cert_filename[0] != 0)
+		{
+			ui_input_init(&cert_password, "");
+			ui.focus = &cert_password;
+			ui.dialog = cert_password_dialog;
+		}
+		else
+			ui.dialog = NULL;
+	}
+}
+
+void do_widget_panel(void)
+{
+	int ff, type;
+	char *value;
+
+	ff = pdf_get_field_flags(ctx, selected_annot->page->doc, selected_annot->obj);
+	type = pdf_field_type(ctx, selected_annot->page->doc, selected_annot->obj);
+
+	if (type == PDF_WIDGET_TYPE_TEXT)
+	{
+		static pdf_annot *last_annot = NULL;
+		static struct input input;
+		ui_label("Value:");
+		if (selected_annot != last_annot)
+		{
+			last_annot = selected_annot;
+			value = pdf_field_value(ctx, selected_annot->page->doc, selected_annot->obj);
+			ui_input_init(&input, value);
+			fz_free(ctx, value);
+		}
+		if (ui_input(&input, 0, (ff & Ff_Multiline) ? 5 : 1) >= UI_INPUT_EDIT)
+		{
+			pdf_field_set_value(ctx, selected_annot->page->doc, selected_annot->obj, input.text);
+			if (pdf_update_page(ctx, selected_annot->page))
+				render_page();
+		}
+	}
+	else if (type == PDF_WIDGET_TYPE_COMBOBOX || type == PDF_WIDGET_TYPE_LISTBOX)
+	{
+		const char **options;
+		int n, choice;
+		ui_label("Value:");
+		n = pdf_choice_widget_options(ctx, selected_annot->page->doc, selected_annot, 0, NULL);
+		options = fz_malloc_array(ctx, n, sizeof(char*));
+		pdf_choice_widget_options(ctx, selected_annot->page->doc, selected_annot, 0, options);
+		value = pdf_field_value(ctx, selected_annot->page->doc, selected_annot->obj);
+		choice = ui_select("Widget/Ch", value, (const char **)options, n);
+		if (choice >= 0)
+		{
+			pdf_field_set_value(ctx, selected_annot->page->doc, selected_annot->obj, options[choice]);
+			if (pdf_update_page(ctx, selected_annot->page))
+				render_page();
+		}
+		fz_free(ctx, value);
+		fz_free(ctx, options);
+	}
+	else if (type == PDF_WIDGET_TYPE_SIGNATURE)
+	{
+		if (ui_button("Verify"))
+		{
+			char status[100];
+			int result;
+			result = pdf_check_signature(ctx, pdf, selected_annot, status, sizeof status);
+			if (result)
+				ui_show_warning_dialog("Signature is valid.\n%s", status);
+			else
+				ui_show_warning_dialog("Could not verify signature:\n%s", status);
+		}
+		if (ui_button("Sign"))
+		{
+			fz_strlcpy(cert_filename, filename, sizeof cert_filename);
+			ui_init_open_file(".", cert_file_filter);
+			ui.dialog = cert_file_dialog;
+		}
+	}
+	else
+	{
+		value = pdf_field_value(ctx, pdf, selected_annot->obj);
+		ui_label("Value: %s", value);
+		fz_free(ctx, value);
+	}
+}