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chore: Seperates readFromKeyboard into a seperate file.

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This commit is contained in:
greysoh 2024-05-06 16:22:22 -04:00
parent 0e60efceee
commit 7f34ddd6c5
Signed by: imterah
GPG key ID: 8FA7DD57BA6CEA37
2 changed files with 92 additions and 90 deletions
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91
lom/src/index.ts
View file

@ -4,6 +4,7 @@ import parseArgsStringToArgv from "string-argv";
import baseAxios from "axios";
import ssh2 from "ssh2";
import { readFromKeyboard } from "./libs/readFromKeyboard.js";
import { commands } from "./commands.js";
let keyFile: Buffer | string | undefined;
@ -16,96 +17,6 @@ const axios = baseAxios.create({
validateStatus: () => true
});
async function readFromKeyboard(stream: ssh2.ServerChannel, disableEcho: boolean = false): Promise<string> {
const leftEscape = "\x1B[D";
const rightEscape = "\x1B[C";
const ourBackspace = "\u0008";
// \x7F = Ascii escape code for backspace (client side)
let line = "";
let lineIndex = 0;
let isReady = false;
async function eventLoop(): Promise<any> {
const readStreamData = stream.read();
if (readStreamData == null) return setTimeout(eventLoop, 5);
if (readStreamData.includes("\r") || readStreamData.includes("\n")) {
line = line.replace("\r", "");
isReady = true;
return;
} else if (readStreamData.includes("\x7F")) {
// TODO (greysoh): investigate maybe potential deltaCursor overflow (haven't tested)
// TODO (greysoh): investigate deltaCursor underflow
// TODO (greysoh): make it not run like shit (I don't know how to describe it)
if (line.length == 0) return setTimeout(eventLoop, 5); // Here because if we do it in the parent if statement, shit breaks
line = line.substring(0, lineIndex - 1) + line.substring(lineIndex);
if (!disableEcho) {
let deltaCursor = line.length - lineIndex;
// wtf?
if (deltaCursor < 0) {
console.log("FIXME: somehow, our deltaCursor value is negative! please investigate me");
return setTimeout(eventLoop, 5);
}
// Jump forward to the front, and remove the last character
stream.write(rightEscape.repeat(deltaCursor) + " " + ourBackspace);
// Go backwards & rerender text & go backwards again (wtf?)
stream.write(leftEscape.repeat(deltaCursor + 1) + line.substring(lineIndex - 1) + leftEscape.repeat(deltaCursor + 1));
}
} else if (readStreamData.includes("\x1B")) {
if (readStreamData.includes(rightEscape)) {
if (lineIndex + 1 > line.length) return setTimeout(eventLoop, 5);
lineIndex += 1;
} else if (readStreamData.includes(leftEscape)) {
if (lineIndex - 1 < 0) return setTimeout(eventLoop, 5);
lineIndex -= 1;
} else {
return setTimeout(eventLoop, 5);
}
if (!disableEcho) stream.write(readStreamData);
} else {
lineIndex += readStreamData.length;
// There isn't a splice method for String prototypes. So, ugh:
line = line.substring(0, lineIndex - 1) + readStreamData + line.substring(lineIndex - 1);
if (!disableEcho) {
let deltaCursor = line.length - lineIndex;
// wtf?
if (deltaCursor < 0) {
console.log("FIXME: somehow, our deltaCursor value is negative! please investigate me");
deltaCursor = 0;
}
stream.write(line.substring(lineIndex - 1) + leftEscape.repeat(deltaCursor));
}
}
setTimeout(eventLoop, 5);
}
// Yes, this is bad practice. Currently, I don't care.
return new Promise(async(resolve) => {
eventLoop();
while (!isReady) {
await new Promise((i) => setTimeout(i, 5));
}
resolve(line);
});
};
try {
keyFile = await readFile("../keys/host.key");
} catch (e) {

91
lom/src/libs/readFromKeyboard.ts Normal file
View file

@ -0,0 +1,91 @@
import type { ServerChannel } from "ssh2";
export async function readFromKeyboard(stream: ServerChannel, disableEcho: boolean = false): Promise<string> {
const leftEscape = "\x1B[D";
const rightEscape = "\x1B[C";
const ourBackspace = "\u0008";
// \x7F = Ascii escape code for backspace (client side)
let line = "";
let lineIndex = 0;
let isReady = false;
async function eventLoop(): Promise<any> {
const readStreamData = stream.read();
if (readStreamData == null) return setTimeout(eventLoop, 5);
if (readStreamData.includes("\r") || readStreamData.includes("\n")) {
line = line.replace("\r", "");
isReady = true;
return;
} else if (readStreamData.includes("\x7F")) {
// TODO (greysoh): investigate maybe potential deltaCursor overflow (haven't tested)
// TODO (greysoh): investigate deltaCursor underflow
// TODO (greysoh): make it not run like shit (I don't know how to describe it)
if (line.length == 0) return setTimeout(eventLoop, 5); // Here because if we do it in the parent if statement, shit breaks
line = line.substring(0, lineIndex - 1) + line.substring(lineIndex);
if (!disableEcho) {
let deltaCursor = line.length - lineIndex;
// wtf?
if (deltaCursor < 0) {
console.log("FIXME: somehow, our deltaCursor value is negative! please investigate me");
return setTimeout(eventLoop, 5);
}
// Jump forward to the front, and remove the last character
stream.write(rightEscape.repeat(deltaCursor) + " " + ourBackspace);
// Go backwards & rerender text & go backwards again (wtf?)
stream.write(leftEscape.repeat(deltaCursor + 1) + line.substring(lineIndex - 1) + leftEscape.repeat(deltaCursor + 1));
}
} else if (readStreamData.includes("\x1B")) {
if (readStreamData.includes(rightEscape)) {
if (lineIndex + 1 > line.length) return setTimeout(eventLoop, 5);
lineIndex += 1;
} else if (readStreamData.includes(leftEscape)) {
if (lineIndex - 1 < 0) return setTimeout(eventLoop, 5);
lineIndex -= 1;
} else {
return setTimeout(eventLoop, 5);
}
if (!disableEcho) stream.write(readStreamData);
} else {
lineIndex += readStreamData.length;
// There isn't a splice method for String prototypes. So, ugh:
line = line.substring(0, lineIndex - 1) + readStreamData + line.substring(lineIndex - 1);
if (!disableEcho) {
let deltaCursor = line.length - lineIndex;
// wtf?
if (deltaCursor < 0) {
console.log("FIXME: somehow, our deltaCursor value is negative! please investigate me");
deltaCursor = 0;
}
stream.write(line.substring(lineIndex - 1) + leftEscape.repeat(deltaCursor));
}
}
setTimeout(eventLoop, 5);
}
// Yes, this is bad practice. Currently, I don't care.
return new Promise(async(resolve) => {
eventLoop();
while (!isReady) {
await new Promise((i) => setTimeout(i, 5));
}
resolve(line);
});
};