Merge pull request #33 from NunoSempere/libre_redirect

feat: redirect websites to open-source frontends 

9 files changed, 214 insertions, 8 deletions

diff --git a/build.sh b/build.sh
index fcb7bea..7805479 100755
--- a/build.sh
+++ b/build.sh
@@ -1,5 +1,6 @@
 CC=clang
 SRC=rose.c
+REQS=./plugins/*/*.c
 DEPS=('webkit2gtk-4.0')
 
 INCS=`pkg-config --cflags ${DEPS[@]}`
@@ -9,4 +10,4 @@ LIBS=`pkg-config --libs ${DEPS[@]}`
 WYEBAB='-L/usr/lib/wyebrowser/adblock.so'
 
 cp -f config.def.h config.h
-$CC $INCS $LIBS $SRC $WYEBAB -o rose
+$CC $INCS $LIBS $REQS $SRC $WYEBAB -o rose
diff --git a/plugins/libre_redirect/libre_redirect.c b/plugins/libre_redirect/libre_redirect.c
new file mode 100644
index 0000000..b9da2b1
--- /dev/null
+++ b/plugins/libre_redirect/libre_redirect.c
@@ -0,0 +1,69 @@
+#include "str_replace_start.h"
+#include <string.h>
+#include <stdio.h>
+#include <stdbool.h>
+#define LIBRE_N 19
+#define DEBUG false
+
+/* Inspired by https://libredirect.github.io/, but in C. */
+
+void str_init(char* str, int n){
+  for(int i=0; i<n; i++){
+    str[i] = ' ';
+  }
+  str[n] = '\0';
+} // could also use <https://manpages.ubuntu.com/manpages/impish/man3/strinit.3pub.html>
+
+int libre_redirect(const char* uri, char* output){
+  int l1 = strlen(uri);
+  int l2 = strlen(output);
+  
+  if((l2 - l1) < LIBRE_N){ 
+    if(DEBUG) printf("Not enough memory\n");
+    return 1; // not enough memory. 
+  }else{
+    char tmp_uri[l2++];
+    char tmp_output[l2++];
+    strcpy(tmp_uri, uri); // strcpy also copies the terminating '\0'
+    strcpy(tmp_output, output);
+  
+    char* annoying_sites[] = { 
+      "https://www.youtube.com", 
+      "https://www.reddit.com", 
+      "https://medium.com", 
+      "https://translate.google.com",
+      "https://forum.effectivealtruism.org",
+      "https://www.bloomberg.com",
+      "https://twitter.com"
+    };
+    char* alternatives[] = { 
+      "https://yt.artemislena.eu", 
+      "https://teddit.nunosempere.com", 
+      "https://scribe.rip", 
+      "https://simplytranslate.org/",
+      "https://ea.greaterwrong.com",
+      "https://archive.is/https://www.bloomberg.com",
+      "https://nitter.net"
+    };
+    int n = sizeof(annoying_sites)/sizeof(annoying_sites[0]);
+    for(int i=0; i<n ; i++){
+      int replace_check = str_replace_start(tmp_uri, annoying_sites[i], alternatives[i], output);
+      if(replace_check == 2){
+	if(DEBUG) printf("tmp_uri: %s\n", tmp_uri);
+	if(DEBUG) printf("output: %s\n", output);
+        // strcpy(output, tmp_uri);
+        // break;
+	return 2;
+      }else if(replace_check == 1){
+        if(DEBUG) printf("replace_check failed\n");
+        return 1;
+      }
+      strcpy(tmp_uri, output);
+      str_init(output, l2);
+    }
+    strcpy(output, tmp_uri);
+  }
+  if(DEBUG) printf("No match found\n\n");
+  return 0;
+  
+}
diff --git a/plugins/libre_redirect/libre_redirect.h b/plugins/libre_redirect/libre_redirect.h
new file mode 100755
index 0000000..aee42f4
--- /dev/null
+++ b/plugins/libre_redirect/libre_redirect.h
@@ -0,0 +1,9 @@
+#ifndef LIBRE_REDIRECT
+#define LIBRE_REDIRECT
+
+#define LIBRE_N 19
+
+int libre_redirect(const char* uri, char* uri_filtered);
+void str_init(char* str, int n);
+
+#endif
diff --git a/plugins/libre_redirect/str_replace_start.c b/plugins/libre_redirect/str_replace_start.c
new file mode 100755
index 0000000..74bff65
--- /dev/null
+++ b/plugins/libre_redirect/str_replace_start.c
@@ -0,0 +1,60 @@
+#include <string.h>
+#include <stdbool.h>
+#include <stdio.h>
+#define DEBUG false
+
+/*
+See also: 
+* <https://web.archive.org/web/20160201212501/coding.debuntu.org/c-implementing-str_replace-replace-all-occurrences-substring>
+* https://github.com/irl/la-cucina/blob/master/str_replace.c
+*/
+
+int str_replace_start(const char* string, const char* target, const char* replacement, char* output){
+  
+  int l1 = strlen(string);
+  int l2 = strlen(target);
+  int l3 = strlen(replacement);
+  int l4 = strlen(output);
+  if(DEBUG) printf("%d,%d,%d,%d\n", l1, l2, l3, l4);
+  // if(DEBUG) printf("%s,%s,%s,%s\n", string, target, replacement, output);
+  
+  if((l4 < (l1 - l2 + l3)) || l4 < l1 ){
+    // Not enough memory in output string.
+    if(DEBUG) printf("String not long enough.\n");
+    return 1; 
+  } 
+  /* else if(l1 < l2){
+    // Not even possible that there is a match.
+    if(DEBUG) printf("Target larger than string.\n");
+    strcpy(output, string);
+  } */
+  else {
+    if(DEBUG) printf("Looking for a match for %s in %s.\n", target, string);
+    int match = true;
+    for(int i=0; i<l2; i++){
+      if(string[i] != target[i]){
+	match = false;
+	break;
+      }
+    }
+    if(match){
+      if(DEBUG) printf("Found match.\n");
+      for(int i=0; i<l3; i++){
+	output[i] = replacement[i];
+      }
+      int counter = l3;
+      for(int i=l2; i<l1; i++){
+        output[counter] = string[i];
+        counter++;
+      }
+      output[counter] = '\0';
+      return 2; // success
+    }
+    else {
+      if(DEBUG) printf("Did not find match.\n");
+      strcpy(output, string);
+    }
+  }
+
+  return 0;
+}
diff --git a/plugins/libre_redirect/str_replace_start.h b/plugins/libre_redirect/str_replace_start.h
new file mode 100755
index 0000000..d9f1235
--- /dev/null
+++ b/plugins/libre_redirect/str_replace_start.h
@@ -0,0 +1,6 @@
+#ifndef STR_REPLACE_H_
+#define STR_REPLACE_H_
+
+int str_replace_start(const char* string, const char* target, const char* replacement, char* output);
+
+#endif
diff --git a/plugins/libre_redirect/str_replace_test/build-example.sh b/plugins/libre_redirect/str_replace_test/build-example.sh
new file mode 100644
index 0000000..a9f8022
--- /dev/null
+++ b/plugins/libre_redirect/str_replace_test/build-example.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+CC=gcc
+
+FLAGS="-std=c99 -Wall -lm"
+
+SRC=example.c
+REQS="../str_replace_start.c ../libre_redirect.c"
+
+echo -e "\n\n\n"
+$CC $FLAGS $SRC $REQS -o example
+
diff --git a/plugins/libre_redirect/str_replace_test/example b/plugins/libre_redirect/str_replace_test/example
new file mode 100755
index 0000000..4e80ab8
--- /dev/null
+++ b/plugins/libre_redirect/str_replace_test/example
diff --git a/plugins/libre_redirect/str_replace_test/example.c b/plugins/libre_redirect/str_replace_test/example.c
new file mode 100644
index 0000000..32285bd
--- /dev/null
+++ b/plugins/libre_redirect/str_replace_test/example.c
@@ -0,0 +1,20 @@
+#include "../libre_redirect.h"
+#include <string.h>
+#include <stdio.h>
+
+int main(){
+  char uri[] = "https://reddit.com/r/blah";
+  
+  int l = LIBRE_N + strlen(uri) + 1;
+  char uri_filtered[l];
+  str_init(uri_filtered, l);
+
+  if(!libre_redirect(uri, uri_filtered)){
+    printf("Filtered uri: %s\n", uri_filtered);
+  }else{
+    printf("Uri: %s\n", uri);
+    // failure; do something with the original uri.
+  }
+}
+
+
diff --git a/rose.c b/rose.c
index 78bdd3b..c71a1b8 100644
--- a/rose.c
+++ b/rose.c
@@ -9,10 +9,12 @@
  *
  * @author: fenze <contact@fenze.dev>
  */
+#include <string.h>
+#include <stdbool.h>
+#include <webkit2/webkit2.h>
 
 #include "config.h"
-
-#include <webkit2/webkit2.h>
+#include "plugins/libre_redirect/libre_redirect.h"
 
 #define CACHE                               			\
 	"base-cache-directory", CACHE_DIR,                   	\
@@ -78,15 +80,43 @@ void load_uri(WebKitWebView *view, const char *uri)
 	}
 }
 
+void redirect_if_annoying(WebKitWebView *view, const char *uri){
+        int l = LIBRE_N + strlen(uri) + 1;
+        char uri_filtered[l];
+        str_init(uri_filtered, l);
+
+        int check = libre_redirect(uri, uri_filtered);
+        if(check == 2){
+                webkit_web_view_load_uri(view, uri_filtered);
+        }
+
+}
+
 void load_changed(WebKitWebView *self, WebKitLoadEvent load_event, GtkNotebook *notebook)
 {
-	if (load_event == WEBKIT_LOAD_FINISHED) {
-		gtk_notebook_set_tab_label_text(notebook, GTK_WIDGET(self),
-						webkit_web_view_get_title(self));
-		gtk_widget_hide(GTK_WIDGET(bar));
-	}
+        switch (load_event) {
+        /* see <https://webkitgtk.org/reference/webkit2gtk/2.5.1/WebKitWebView.html> */
+                case WEBKIT_LOAD_STARTED:
+                                redirect_if_annoying(self, webkit_web_view_get_uri(self));
+                                break;
+                case WEBKIT_LOAD_REDIRECTED:
+                                redirect_if_annoying(self, webkit_web_view_get_uri(self));
+                                break;
+                case WEBKIT_LOAD_COMMITTED:
+                                redirect_if_annoying(self, webkit_web_view_get_uri(self));
+                                break;
+                case WEBKIT_LOAD_FINISHED:
+                {
+                                const char* title = webkit_web_view_get_title(self);
+                                gtk_notebook_set_tab_label_text(notebook, GTK_WIDGET(self),
+                                                title == NULL ? "—" : title );
+                                // gtk_widget_hide(GTK_WIDGET(bar));
+                                break;
+                }
+        }
 }
 
+
 void notebook_append(GtkNotebook *notebook, const char *uri)
 {
 	GdkScreen *screen = gtk_window_get_screen(GTK_WINDOW(window));