100 lines
2.8 KiB
Bash
100 lines
2.8 KiB
Bash
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#!/bin/sh
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# Tar listening backend.
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# This backend looks for tarfiles in the folder specified by $inbox.
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# It then un-tars them and and gets the username, title and post content
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# from their respecively named files. It will use the first image matching
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# one of $image_types types as the image for the post.
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# TODO: Trap the exit signal to kill nc
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# or maybe use telnet
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# TODO: make this file backend agnostic
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. ./globals.sh
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echo "Using tar backend." >> "$log_file"
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gen_post_from_dir() {
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local dir="$1"
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local post_to="$(basename "$dir" | sed 's/-.*//g')" # where the post wants to go
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local board=""
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local parent=""
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local user=""
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local title=""
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local content=""
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local image_name=""
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local image_content=""
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local image_path=""
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echo "New post"
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if echo "$post_to" | grep -qE "[0-9]$" # if our post is a reply
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then
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# set the parent to the post it is replying to
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parent="$(find $board_dir -maxdepth 3 -name "$post_to" -not -path '*/\.*')"
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# make sure the parent post exists
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if [ -z "$parent" ]; then echo "Parent post does not exist" && return 1; fi
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# and set the board value to the board it is to be posted to
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board="$(basename `dirname "$parent"`)"
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# then change the parent value from a directory path to a plain string
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parent="$(basename `realpath "$parent"`)"
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else # otherwise, the post is an OP post.
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# set the board value to the board it is to be posted to
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board="$post_to"
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fi
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image_path="$(find "$dir" | grep -Em1 "$image_types")"
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if ! [ -z "$image_path" ]
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then
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image_name="$(basename "$image_path")"
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image_content="$(cat "$image_path" | base64 -w 0)"
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fi
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user="$(cat "$dir/user")"
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content="$(tr '\n' '\a' < "$dir/content")" # change newline characters to BEL
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title="$(cat "$dir/title")"
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echo "board:$board"
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echo "parent:$parent"
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echo "user:$user"
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echo "title:$title"
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echo "content:$content"
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echo "image_name:$image_name"
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echo "image_content:$image_content"
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echo "End new post"
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return 0
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}
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listen() {
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# NOTE: Tar extraction takes a nontrivial amount of time, which
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# means if two connections were made in close succecion
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# there is a possibility that the second connection would
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# not receive the "busy" signal, and send it's data anyways
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#
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# additionally, there should be a way to prevent the sending of
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# malicious data to interfere with normal post processing
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#
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# to prevent zip bombs, break the tar -x -C operation up and use
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# `zcat $file | head -c $file_limit`
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blocker_pid="" # the pid of the loop that sends the busy signal
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while nc -lp "$port" | tar -x -C "$inbox"
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do
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(while true
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do
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echo "Busy" | nc -lp 7070
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done)>/dev/null & blocker_pid="$!"
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for dir in $inbox/*
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do
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echo "Got post" >> "$log_file"
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gen_post_from_dir "$dir"
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rm -rf "$dir"
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done
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kill "$blocker_pid" >/dev/null
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done
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}
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