Undo test commit

.gitignore

@@ -0,0 +1,2 @@
+archives/
+previews/

README.md

@@ -1,7 +1,11 @@
 # Autoshare
 
-An upcoming project. This will be a single program that fully automates the content sharing process (packing content into archives, creating previews, uploading archives and previews, and creating a post template ready to be copied and pasted.
+An upcoming project. This will be a single program that fully automates the content sharing process (packing content into archives, creating previews, uploading archives and previews, and creating a post template ready to be copied and pasted).
 
 It will be written in a mixture of Bash and Python. Tails and Whonix will be supported, with the goal of making the program work natively in Tails without the need to install additional software.
 
 Anyone is welcome to collaborate with me.
+
+## Collaborators
+
+Currently it is not possible to submit pull requests when using the Tor Browser on the Safest setting. Please do not fork this repo attempting to submit a pull request. Instead leave a comment in [this thread](http://onion.tor.my/PedoDeveloper/autoshare/issues/7) and you will be added as a collaborator

includes/functions.sh

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+#!/bin/bash
+# Common utility functions shared across multiple files.
+
+RESET="\033[0m"
+GREEN="\033[1;32m"
+YELLOW="\033[1;33m"
+RED="\033[1;31m"
+
+check_dependencies() {
+	# Usage: check_dependencies "7z" "unrar" "curl" ...
+	local dependencies=()
+	local dependency
+
+	for dependency in "$@"; do
+		if ! command -v "$dependency" >/dev/null; then
+			dependencies+=("$dependency")
+		fi
+	done
+
+	if (( "${#dependencies[@]}" > 0 )); then
+		log "ERROR" "Missing dependencies" "${dependencies[@]}"
+		return 1
+	fi
+}
+
+log() {
+	# Usage: log "NOTICE|WARN|ERROR" "this is a log message" ...
+	local caller="${0##*/}"
+	local level="$1"; shift
+	local color
+
+	case "$level" in
+		NOTICE) color="$GREEN" ;;
+		WARN) color="$YELLOW" ;;
+		ERROR) color="$RED" ;;
+
+		# No color for these levels.
+		INFO) color="" ;;
+		*) color="" ;;
+	esac
+
+	echo -e "$caller: ${color}[$level]: $*${RESET}" >&2
+}

modules/create_archive

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+#!/bin/bash
+# This script packs a file or directory into a 7z archive with the given password.
+# It can (optionally) split the archives into volumes of a fixed size in megabytes.
+
+source "$(dirname "$0")/../includes/functions.sh"
+
+set -euo pipefail
+
+cleanup() {
+	local archive_name="$1"
+	rm -f "${archive_name}"*
+	log "INFO" "Cleaning up ${archive_name##*/} remains before exit"
+}
+
+check_input() {
+	local input_file="$1"
+	local password="$2"
+	local size="$3"
+
+	[[ -e "$input_file" ]] || { log "ERROR" "Input file '${input_file}' does not exist"; exit 2; }
+	[[ -n "${password}" ]] || { log "ERROR" "No password given"; exit 2; }
+	[[ "$size" =~ ^([1-9][0-9]*)?$ ]] || { log "ERROR" "Invalid size '$size', must be empty or a positive number"; exit 2; }
+}
+
+calc_smart_volumes() {
+	# Calculates a "smart" volume size so that each volume (including the final part)
+	# will be approximately the same size
+	local input_file="$1"
+	local size="$2"
+	local total_size num_volumes smart_size
+
+	total_size=$(du -s -BM "${input_file}" | grep -oP '^\d+') || return 1
+
+	# If total file size is smaller than volume size, don't pack it into volumes
+	if (( total_size < size)); then
+		log "WARN" "$input_file is smaller than ${size}MB, skipping volumes"
+		return 1
+	fi
+
+	num_volumes=$(( (total_size + size - 1) / size ))
+	smart_size=$(( (total_size + num_volumes - 1) / num_volumes ))
+
+	log "INFO" "Calculated smart volume size '$smart_size'"
+
+	echo "$smart_size"
+}
+
+get_volumes() {
+	local input_file="$1"
+	local size="${2:-}"
+	local volumes=""
+	local smart_size=""
+
+	if [[ -n "$size" ]]; then
+		log "INFO" "Volumes size is set to ${size}MB"
+		smart_size="$(calc_smart_volumes "$input_file" "$size" || true)"
+	fi
+
+	if [[ -n "$smart_size" ]]; then
+		volumes="-v${smart_size}m"
+		log "INFO" "Volumes set to '$volumes'"
+	else
+		log "INFO" "Volumes argument unset"
+	fi
+
+	echo "$volumes"
+}
+
+generate_name() {
+	# Generates a random archive name of 20 alphanumeric characters
+	local archive_dir="$1"
+	local archive_name
+	archive_name="$archive_dir/$(tr -dc '[:alnum:]' < /dev/urandom | head -c 20).7z"
+
+	log "INFO" "Generated archive name '$archive_name'"
+	
+	echo "$archive_name"
+}
+
+create_archive() {
+	local input_file="$1"
+	local password="$2"
+	local volumes="$3"
+	local archive_name="$4"
+
+	7z a -mhe=on "-p${password}" "$volumes" "$archive_name" "${input_file}"
+}
+
+main() {
+	local input_file="${1:-}"
+	local password="${2:-}"
+	local size="${3:-}"
+	local volumes archive_name archive_dir
+
+	check_dependencies "7z"
+	check_input "$input_file" "$password" "$size"
+
+	archive_dir="$(dirname "$0")/../archives"
+	mkdir -p "$archive_dir"
+
+	archive_name="$(generate_name "$archive_dir")"
+	volumes="$(get_volumes "$input_file" "$size")"
+
+	log "INFO" "Packing '${input_file}' into archive '$archive_name' with password '${password}'"
+
+	trap 'cleanup "$archive_name"' ERR INT
+	create_archive \
+		"$input_file" \
+		"$password" \
+		"$volumes" \
+		"$archive_name"
+
+	log "NOTICE" "Archive created"
+}
+
+main "$@"

modules/create_video_previews

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+#!/bin/bash
+
+preview_dir="$(dirname "$0")/../previews"
+
+search_dir="${1}"
+
+check_dependencies() {
+	if ! mkdir -p "$preview_dir"; then
+		echo "ERROR: Unable to create preview directory"
+		exit 1
+	elif ! command -v ffmpeg xargs 2>&1 >/dev/null; then
+		echo "ERROR: FFmpeg and xargs must be installed"
+		exit 1
+	fi
+}
+
+check_input() {
+	if [[ ! -e "${search_dir}" ]]; then
+		echo "ERROR: Input file '${search_dir}' does not exist"
+		exit 2
+	fi
+}
+
+# Search for videos recursively using the MIME type
+find_videos() {
+	video_list=$(find ${search_dir} -type f -print0 | xargs -0 file -i | grep -oP '.*(?=:\s+video/)')
+
+	echo "${video_list}" >&2
+}
+
+create_previews() {
+	while IFS= read -r video; do
+		echo "Making preview for ${video}"
+		make_preview
+	done <<< "${video_list}"
+}
+
+get_size() {
+	IFS=','
+	read -r width height <<< $(ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of csv=p=0 "${video}")
+
+	if (( $width >= $height )); then
+		rows=4 cols=5
+		scale_format="200:-1"
+	else
+		rows=5 cols=4
+		scale_format="-1:200"
+	fi
+}
+
+get_num_frames() {
+	local num_snapshots=$(( rows * cols ))
+
+	num_frames=$(ffprobe -v error -select_streams v:0 -count_frames -show_entries stream=nb_read_frames -of csv=p=0 "${video}")
+	echo "Num frames: $num_frames" >&2
+
+	frames_per_snapshot=$(( num_frames / num_snapshots ))
+}
+
+make_preview() {
+	get_size
+	get_num_frames
+
+	filename="$preview_dir/$(basename "${video}").webp"
+	filters="select=not(mod(n\,$frames_per_snapshot)),scale=$scale_format,tile=${rows}x${cols}"
+
+    ffmpeg -nostdin -loglevel panic -i "${video}" -frames 1 -q:v 90 -vf "$filters" "${filename}"
+}
+
+check_dependencies
+check_input
+find_videos
+create_previews