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
This commit is contained in:
NunoSempere 2022-12-17 20:47:44 +01:00
parent 62b1bd6785
commit 6ff86dcc44
7 changed files with 175 additions and 0 deletions

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#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;
}

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#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

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#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;
}

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#ifndef STR_REPLACE_H_
#define STR_REPLACE_H_
int str_replace_start(const char* string, const char* target, const char* replacement, char* output);
#endif

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#!/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

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#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.
}
}