feat: redirect websites to open-source frontends
1. Adds code for redirecting annoying websites to their open-source frontends, when these exist. 2. Organize this in a "plugins" folder
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69
plugins/libre_redirect/libre_redirect.c
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69
plugins/libre_redirect/libre_redirect.c
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#include "str_replace_start.h"
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#include <string.h>
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#include <stdio.h>
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#include <stdbool.h>
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#define LIBRE_N 19
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#define DEBUG false
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/* Inspired by https://libredirect.github.io/, but in C. */
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void str_init(char* str, int n){
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for(int i=0; i<n; i++){
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str[i] = ' ';
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}
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str[n] = '\0';
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} // could also use <https://manpages.ubuntu.com/manpages/impish/man3/strinit.3pub.html>
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int libre_redirect(const char* uri, char* output){
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int l1 = strlen(uri);
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int l2 = strlen(output);
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if((l2 - l1) < LIBRE_N){
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if(DEBUG) printf("Not enough memory\n");
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return 1; // not enough memory.
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}else{
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char tmp_uri[l2++];
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char tmp_output[l2++];
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strcpy(tmp_uri, uri); // strcpy also copies the terminating '\0'
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strcpy(tmp_output, output);
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char* annoying_sites[] = {
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"https://www.youtube.com",
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"https://www.reddit.com",
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"https://medium.com",
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"https://translate.google.com",
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"https://forum.effectivealtruism.org",
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"https://www.bloomberg.com",
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"https://twitter.com"
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};
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char* alternatives[] = {
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"https://yt.artemislena.eu",
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"https://teddit.nunosempere.com",
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"https://scribe.rip",
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"https://simplytranslate.org/",
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"https://ea.greaterwrong.com",
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"https://archive.is/https://www.bloomberg.com",
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"https://nitter.net"
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};
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int n = sizeof(annoying_sites)/sizeof(annoying_sites[0]);
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for(int i=0; i<n ; i++){
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int replace_check = str_replace_start(tmp_uri, annoying_sites[i], alternatives[i], output);
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if(replace_check == 2){
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if(DEBUG) printf("tmp_uri: %s\n", tmp_uri);
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if(DEBUG) printf("output: %s\n", output);
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// strcpy(output, tmp_uri);
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// break;
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return 2;
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}else if(replace_check == 1){
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if(DEBUG) printf("replace_check failed\n");
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return 1;
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}
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strcpy(tmp_uri, output);
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str_init(output, l2);
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}
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strcpy(output, tmp_uri);
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}
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if(DEBUG) printf("No match found\n\n");
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return 0;
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}
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9
plugins/libre_redirect/libre_redirect.h
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9
plugins/libre_redirect/libre_redirect.h
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#ifndef LIBRE_REDIRECT
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#define LIBRE_REDIRECT
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#define LIBRE_N 19
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int libre_redirect(const char* uri, char* uri_filtered);
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void str_init(char* str, int n);
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#endif
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60
plugins/libre_redirect/str_replace_start.c
Executable file
60
plugins/libre_redirect/str_replace_start.c
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#include <string.h>
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#include <stdbool.h>
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#include <stdio.h>
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#define DEBUG false
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/*
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See also:
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* <https://web.archive.org/web/20160201212501/coding.debuntu.org/c-implementing-str_replace-replace-all-occurrences-substring>
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* https://github.com/irl/la-cucina/blob/master/str_replace.c
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*/
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int str_replace_start(const char* string, const char* target, const char* replacement, char* output){
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int l1 = strlen(string);
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int l2 = strlen(target);
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int l3 = strlen(replacement);
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int l4 = strlen(output);
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if(DEBUG) printf("%d,%d,%d,%d\n", l1, l2, l3, l4);
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// if(DEBUG) printf("%s,%s,%s,%s\n", string, target, replacement, output);
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if((l4 < (l1 - l2 + l3)) || l4 < l1 ){
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// Not enough memory in output string.
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if(DEBUG) printf("String not long enough.\n");
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return 1;
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}
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/* else if(l1 < l2){
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// Not even possible that there is a match.
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if(DEBUG) printf("Target larger than string.\n");
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strcpy(output, string);
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} */
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else {
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if(DEBUG) printf("Looking for a match for %s in %s.\n", target, string);
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int match = true;
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for(int i=0; i<l2; i++){
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if(string[i] != target[i]){
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match = false;
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break;
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}
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}
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if(match){
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if(DEBUG) printf("Found match.\n");
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for(int i=0; i<l3; i++){
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output[i] = replacement[i];
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}
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int counter = l3;
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for(int i=l2; i<l1; i++){
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output[counter] = string[i];
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counter++;
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}
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output[counter] = '\0';
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return 2; // success
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}
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else {
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if(DEBUG) printf("Did not find match.\n");
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strcpy(output, string);
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}
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}
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return 0;
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}
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6
plugins/libre_redirect/str_replace_start.h
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6
plugins/libre_redirect/str_replace_start.h
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#ifndef STR_REPLACE_H_
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#define STR_REPLACE_H_
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int str_replace_start(const char* string, const char* target, const char* replacement, char* output);
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#endif
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11
plugins/libre_redirect/str_replace_test/build-example.sh
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11
plugins/libre_redirect/str_replace_test/build-example.sh
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#!/bin/bash
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CC=gcc
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FLAGS="-std=c99 -Wall -lm"
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SRC=example.c
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REQS="../str_replace_start.c ../libre_redirect.c"
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echo -e "\n\n\n"
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$CC $FLAGS $SRC $REQS -o example
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BIN
plugins/libre_redirect/str_replace_test/example
Executable file
BIN
plugins/libre_redirect/str_replace_test/example
Executable file
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20
plugins/libre_redirect/str_replace_test/example.c
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20
plugins/libre_redirect/str_replace_test/example.c
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#include "../libre_redirect.h"
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#include <string.h>
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#include <stdio.h>
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int main(){
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char uri[] = "https://reddit.com/r/blah";
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int l = LIBRE_N + strlen(uri) + 1;
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char uri_filtered[l];
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str_init(uri_filtered, l);
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if(!libre_redirect(uri, uri_filtered)){
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printf("Filtered uri: %s\n", uri_filtered);
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}else{
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printf("Uri: %s\n", uri);
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// failure; do something with the original uri.
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}
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}
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