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Improve checking entries in the hostfile #38

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Improve checking entries in the hostfile #38

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4 changes: 2 additions & 2 deletions src/platforms/darwin.ts
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Expand Up @@ -2,7 +2,7 @@ import path from 'path';
import { writeFileSync as writeFile, existsSync as exists, readFileSync as read } from 'fs';
import createDebug from 'debug';
import { sync as commandExists } from 'command-exists';
import { run } from '../utils';
import { isDomainInHostFile, run } from '../utils';
import { Options } from '../index';
import { addCertificateToNSSCertDB, openCertificateInFirefox, closeFirefox } from './shared';
import { Platform } from '.';
Expand Down Expand Up @@ -58,7 +58,7 @@ export default class MacOSPlatform implements Platform {

async addDomainToHostFileIfMissing(domain: string) {
let hostsFileContents = read(this.HOST_FILE_PATH, 'utf8');
if (!hostsFileContents.includes(domain)) {
if (!isDomainInHostFile(hostsFileContents, domain)) {
run(`echo '\n127.0.0.1 ${ domain }' | sudo tee -a "${ this.HOST_FILE_PATH }" > /dev/null`);
}
}
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4 changes: 2 additions & 2 deletions src/platforms/linux.ts
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Expand Up @@ -3,7 +3,7 @@ import { existsSync as exists, readFileSync as read, writeFileSync as writeFile
import createDebug from 'debug';
import { sync as commandExists } from 'command-exists';
import { addCertificateToNSSCertDB, openCertificateInFirefox, closeFirefox } from './shared';
import { run } from '../utils';
import { isDomainInHostFile, run } from '../utils';
import { Options } from '../index';
import UI from '../user-interface';
import { Platform } from '.';
Expand Down Expand Up @@ -70,7 +70,7 @@ export default class LinuxPlatform implements Platform {

async addDomainToHostFileIfMissing(domain: string) {
let hostsFileContents = read(this.HOST_FILE_PATH, 'utf8');
if (!hostsFileContents.includes(domain)) {
if (!isDomainInHostFile(hostsFileContents, domain)) {
run(`echo '127.0.0.1 ${ domain }' | sudo tee -a "${ this.HOST_FILE_PATH }" > /dev/null`);
}
}
Expand Down
4 changes: 2 additions & 2 deletions src/platforms/win32.ts
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Expand Up @@ -4,7 +4,7 @@ import { writeFileSync as write, readFileSync as read } from 'fs';
import { Options } from '../index';
import { openCertificateInFirefox } from './shared';
import { Platform } from '.';
import { run, sudo } from '../utils';
import { isDomainInHostFile, run, sudo, } from '../utils';
import UI from '../user-interface';

const debug = createDebug('devcert:platforms:windows');
Expand Down Expand Up @@ -46,7 +46,7 @@ export default class WindowsPlatform implements Platform {

async addDomainToHostFileIfMissing(domain: string) {
let hostsFileContents = read(this.HOST_FILE_PATH, 'utf8');
if (!hostsFileContents.includes(domain)) {
if (!isDomainInHostFile(hostsFileContents, domain)) {
await sudo(`echo 127.0.0.1 ${ domain } > ${ this.HOST_FILE_PATH }`);
}
}
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10 changes: 10 additions & 0 deletions src/utils.ts
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Expand Up @@ -49,3 +49,13 @@ export function sudo(cmd: string): Promise<string | null> {
});
});
}

export function isDomainInHostFile(hostFileContents: string, domain: string): boolean {
// Do a check for a full match since a string includes can be fooled by
// a subdomain being present in the host file.
const isPresent = hostFileContents
.replace(/\s+/g, " ")
.split(" ")
.filter(item => item === domain).length > 0;
return isPresent;
}
Comment on lines +53 to +61
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This looks like pretty solid code, but I'm not 100% sure it'll work for all possible hostfile contents, such as tab characters, different encodings, or comments. Maybe it would be easier to bring in a tool like https://www.npmjs.com/package/hostile which has a well-tested hostfile parser.

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This was a pretty quick and dirty way of improving the checking. Your are right that can be fooled by domains in comments, which the previous code had a problem with as well. I'll take a look hostile and see what that looks like to bring in.