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Edit File : wcurl \| Size : 11.31 KB
#!/bin/sh # wcurl - a simple wrapper around curl to easily download files. # # Requires curl >= 7.46.0 (2015) # # Copyright (C) Samuel Henrique <samueloph@debian.org>, Sergio Durigan # Junior <sergiodj@debian.org> and many contributors, see the AUTHORS # file. # # Permission to use, copy, modify, and distribute this software for any purpose # with or without fee is hereby granted, provided that the above copyright # notice and this permission notice appear in all copies. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN # NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, # DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR # OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE # OR OTHER DEALINGS IN THE SOFTWARE. # # Except as contained in this notice, the name of a copyright holder shall not be # used in advertising or otherwise to promote the sale, use or other dealings in # this Software without prior written authorization of the copyright holder. # # SPDX-License-Identifier: curl # Stop on errors and on usage of unset variables. set -eu VERSION="2026.01.05" PROGRAM_NAME="$(basename "$0")" readonly PROGRAM_NAME # Display the version. print_version() { cat << _EOF_ ${VERSION} _EOF_ } # Display the program usage. usage() { cat << _EOF_ ${PROGRAM_NAME} -- a simple wrapper around curl to easily download files. Usage: ${PROGRAM_NAME} <URL>... ${PROGRAM_NAME} [--curl-options <CURL_OPTIONS>]... [--no-decode-filename] [-o\|-O\|--output <PATH>] [--dry-run] [--] <URL>... ${PROGRAM_NAME} [--curl-options=<CURL_OPTIONS>]... [--no-decode-filename] [--output=<PATH>] [--dry-run] [--] <URL>... ${PROGRAM_NAME} -h\|--help ${PROGRAM_NAME} -V\|--version Options: --curl-options <CURL_OPTIONS>: Specify extra options to be passed when invoking curl. May be specified more than once. -o, -O, --output <PATH>: Use the provided output path instead of getting it from the URL. If multiple URLs are provided, resulting files share the same name with a number appended to the end (curl >= 7.83.0). If this option is provided multiple times, only the last value is considered. --no-decode-filename: Do not percent-decode the output filename, even if the percent-encoding in the URL was done by wcurl, e.g.: The URL contained whitespace. --dry-run: Do not actually execute curl, just print what would be invoked. -V, --version: Print version information. -h, --help: Print this usage message. <CURL_OPTIONS>: Any option supported by curl can be set here. This is not used by wcurl; it is instead forwarded to the curl invocation. <URL>: URL to be downloaded. Anything that is not a parameter is considered an URL. Whitespace is percent-encoded and the URL is passed to curl, which then performs the parsing. May be specified more than once. _EOF_ } # Display an error message and bail out. error() { printf "%s\n" "$" >&2 exit 1 } # Extra curl options provided by the user. # This is set per-URL for every URL provided. # Some options are global, but we are erroring on the side of needlessly setting # them multiple times instead of causing issues with parameters that needs to # be set per-URL. CURL_OPTIONS="" # The URLs to be downloaded. URLS="" # Variable used to be set to the percent-decoded filename parsed from the URL, unless # --output or --no-decode-filename are used. OUTPUT_PATH="" HAS_USER_SET_OUTPUT="false" # The parameters that are passed per-URL to curl. readonly PER_URL_PARAMETERS="\ --fail \ --globoff \ --location \ --proto-default https \ --remote-time \ --retry 5 " # Valid percent-encode codes that are considered unsafe to be decoded. # This is a list of space-separated percent-encoded uppercase # characters. # 2F = / # 5C = \ # 3A = : readonly UNSAFE_PERCENT_ENCODE="%2F %5C %3A" # Whether to invoke curl or not. DRY_RUN="false" # Sanitize parameters. sanitize() { if [ -z "${URLS}" ]; then error "You must provide at least one URL to download." fi readonly CURL_OPTIONS URLS DRY_RUN HAS_USER_SET_OUTPUT } # Indicate via exit code whether the string given in the first parameter # consists solely of characters from the string given in the second parameter. # In other words, it returns 0 if the first parameter only contains characters # from the second parameter, e.g.: Are $1 characters a subset of $2 characters? is_subset_of() { case "${1}" in [!${2}]* \| '') return 1 ;; esac } # Indicate via exit code whether the HTML code given in the first # parameter is safe to be decoded. is_safe_percent_encode() { upper_str=$(printf "%s" "${1}" \| tr "[:lower:]" "[:upper:]") for unsafe in ${UNSAFE_PERCENT_ENCODE}; do if [ "${unsafe}" = "${upper_str}" ]; then return 1 fi done return 0 } # Print the given string percent-decoded. percent_decode() { # Encodings of control characters (00-1F) are passed through without decoding. # Iterate on the input character-by-character, decoding it. printf "%s\n" "${1}" \| fold -w1 \| while IFS= read -r decode_out; do # If character is a "%", read the next character as decode_hex1. if [ "${decode_out}" = % ] && IFS= read -r decode_hex1; then decode_out="${decode_out}${decode_hex1}" # If there is one more character, read it as decode_hex2. if IFS= read -r decode_hex2; then decode_out="${decode_out}${decode_hex2}" # Skip decoding if this is a control character (00-1F). # Skip decoding if DECODE_FILENAME is not "true". if [ "${DECODE_FILENAME}" = "true" ] \ && is_subset_of "${decode_hex1}" "23456789abcdefABCDEF" \ && is_subset_of "${decode_hex2}" "0123456789abcdefABCDEF" \ && is_safe_percent_encode "${decode_out}"; then # Use printf to decode it into octal and then decode it to the final format. decode_out="$(printf "%b" "\\$(printf %o "0x${decode_hex1}${decode_hex2}")")" fi fi fi printf %s "${decode_out}" done } # Print the percent-decoded filename portion of the given URL. get_url_filename() { # Remove protocol and query string if present. hostname_and_path="$(printf %s "${1}" \| sed -e 's,^[^/]//,,' -e 's,?.$,,')" # If what remains contains a slash, there is a path; return it percent-decoded. case "${hostname_and_path}" in # sed to remove everything preceding the last '/', e.g.: "example/something" becomes "something" # sed to also replace ':' with the percent_encoded %3A /) percent_decode "$(printf %s "${hostname_and_path}" \| sed -e 's,^./,,' -e 's,:,%3A,g')" ;; esac # No slash means there was just a hostname and no path; return empty string. } # Execute curl with the list of URLs provided by the user. exec_curl() { CMD="curl " # Store version to check if it supports --no-clobber, --parallel and --parallel-max-host. curl_version=$($CMD --version \| cut -f2 -d' ' \| head -n1) curl_version_major=$(echo "$curl_version" \| cut -f1 -d.) curl_version_minor=$(echo "$curl_version" \| cut -f2 -d.) CURL_NO_CLOBBER="" CURL_PARALLEL="" if [ "${curl_version_major}" -ge 8 ]; then CURL_NO_CLOBBER="--no-clobber" CURL_PARALLEL="--parallel --parallel-max-host 5" # --parallel-max-host is only supported since 8.16.0. if [ "${curl_version_major}" -eq 8 ] && [ "${curl_version_minor}" -lt 16 ]; then CURL_PARALLEL="--parallel" fi elif [ "${curl_version_major}" -eq 7 ]; then # --no-clobber is only supported since 7.83.0. if [ "${curl_version_minor}" -ge 83 ]; then CURL_NO_CLOBBER="--no-clobber" fi # --parallel is only supported since 7.66.0. if [ "${curl_version_minor}" -ge 66 ]; then CURL_PARALLEL="--parallel" fi fi # Detecting whether we need --parallel. It is easier to rely on # the shell's argument parsing. # shellcheck disable=SC2086 set -- $URLS # If there are less than two URLs, do not set the parallel flag. if [ "$#" -lt 2 ]; then CURL_PARALLEL="" fi # Start assembling the command. # # We use 'set --' here (again) because (a) we do not have arrays on # POSIX shell, and (b) we need better control over the way we # split arguments. # # shellcheck disable=SC2086 set -- ${CMD} ${CURL_PARALLEL} NEXT_PARAMETER="" for url in ${URLS}; do # If the user did not provide an output path, define one. if [ "${HAS_USER_SET_OUTPUT}" = "false" ]; then OUTPUT_PATH="$(get_url_filename "${url}")" # If we could not get a path from the URL, use the default: index.html. [ -z "${OUTPUT_PATH}" ] && OUTPUT_PATH=index.html fi # shellcheck disable=SC2086 set -- "$@" ${NEXT_PARAMETER} ${PER_URL_PARAMETERS} ${CURL_NO_CLOBBER} --output "${OUTPUT_PATH}" ${CURL_OPTIONS} "${url}" NEXT_PARAMETER="--next" done if [ "${DRY_RUN}" = "false" ]; then exec "$@" else printf "%s\n" "$@" fi } # Default to decoding the output filename DECODE_FILENAME="true" # Use "${1-}" in order to avoid errors because of 'set -u'. while [ -n "${1-}" ]; do case "${1}" in --curl-options=) opt=$(printf "%s\n" "${1}" \| sed 's/^--curl-options=//') CURL_OPTIONS="${CURL_OPTIONS} ${opt}" ;; --curl-options) shift CURL_OPTIONS="${CURL_OPTIONS} ${1}" ;; --dry-run) DRY_RUN="true" ;; --output=) opt=$(printf "%s\n" "${1}" \| sed 's/^--output=//') HAS_USER_SET_OUTPUT="true" OUTPUT_PATH="${opt}" ;; -o \| -O \| --output) shift HAS_USER_SET_OUTPUT="true" OUTPUT_PATH="${1}" ;; -o \| -O) opt=$(printf "%s\n" "${1}" \| sed 's/^-[oO]//') HAS_USER_SET_OUTPUT="true" OUTPUT_PATH="${opt}" ;; --no-decode-filename) DECODE_FILENAME="false" ;; -h \| --help) usage exit 0 ;; -V \| --version) print_version exit 0 ;; --) # This is the start of the list of URLs. shift for url in "$@"; do # Encode whitespace into %20, since wget supports those URLs. newurl=$(printf "%s\n" "${url}" \| sed 's/ /%20/g') URLS="${URLS} ${newurl}" done break ;; -) error "Unknown option: '$1'." ;; *) # This must be a URL. # Encode whitespace into %20, since wget supports those URLs. newurl=$(printf "%s\n" "${1}" \| sed 's/ /%20/g') URLS="${URLS} ${newurl}" ;; esac shift done sanitize exec_curl Back

Edit File : wcurl | Size : 11.31 KB

#!/bin/sh

# wcurl - a simple wrapper around curl to easily download files.
#
# Requires curl >= 7.46.0 (2015)
#
# Copyright (C) Samuel Henrique <samueloph@debian.org>, Sergio Durigan
# Junior <sergiodj@debian.org> and many contributors, see the AUTHORS
# file.
#
# Permission to use, copy, modify, and distribute this software for any purpose
# with or without fee is hereby granted, provided that the above copyright
# notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN
# NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
# OR OTHER DEALINGS IN THE SOFTWARE.
#
# Except as contained in this notice, the name of a copyright holder shall not be
# used in advertising or otherwise to promote the sale, use or other dealings in
# this Software without prior written authorization of the copyright holder.
#
# SPDX-License-Identifier: curl

# Stop on errors and on usage of unset variables.
set -eu

VERSION="2026.01.05"

PROGRAM_NAME="$(basename "$0")"
readonly PROGRAM_NAME

# Display the version.
print_version()
{
    cat << _EOF_
${VERSION}
_EOF_
}

# Display the program usage.
usage()
{
    cat << _EOF_
${PROGRAM_NAME} -- a simple wrapper around curl to easily download files.

Usage: ${PROGRAM_NAME} <URL>...
       ${PROGRAM_NAME} [--curl-options <CURL_OPTIONS>]... [--no-decode-filename] [-o|-O|--output <PATH>] [--dry-run] [--] <URL>...
       ${PROGRAM_NAME} [--curl-options=<CURL_OPTIONS>]... [--no-decode-filename] [--output=<PATH>] [--dry-run] [--] <URL>...
       ${PROGRAM_NAME} -h|--help
       ${PROGRAM_NAME} -V|--version

Options:

--curl-options <CURL_OPTIONS>: Specify extra options to be passed when invoking curl. May be
                                 specified more than once.

-o, -O, --output <PATH>: Use the provided output path instead of getting it from the URL. If
                           multiple URLs are provided, resulting files share the same name with a
                           number appended to the end (curl >= 7.83.0). If this option is provided
                           multiple times, only the last value is considered.

--no-decode-filename: Do not percent-decode the output filename, even if the percent-encoding in
                        the URL was done by wcurl, e.g.: The URL contained whitespace.

--dry-run: Do not actually execute curl, just print what would be invoked.

-V, --version: Print version information.

-h, --help: Print this usage message.

<CURL_OPTIONS>: Any option supported by curl can be set here. This is not used by wcurl; it is
                 instead forwarded to the curl invocation.

<URL>: URL to be downloaded. Anything that is not a parameter is considered
         an URL. Whitespace is percent-encoded and the URL is passed to curl, which
         then performs the parsing. May be specified more than once.
_EOF_
}

# Display an error message and bail out.
error()
{
    printf "%s\n" "$*" >&2
    exit 1
}

# Extra curl options provided by the user.
# This is set per-URL for every URL provided.
# Some options are global, but we are erroring on the side of needlessly setting
# them multiple times instead of causing issues with parameters that needs to
# be set per-URL.
CURL_OPTIONS=""

# The URLs to be downloaded.
URLS=""

# Variable used to be set to the percent-decoded filename parsed from the URL, unless
# --output or --no-decode-filename are used.
OUTPUT_PATH=""
HAS_USER_SET_OUTPUT="false"

# The parameters that are passed per-URL to curl.
readonly PER_URL_PARAMETERS="\
    --fail \
    --globoff \
    --location \
    --proto-default https \
    --remote-time \
    --retry 5 "

# Valid percent-encode codes that are considered unsafe to be decoded.
# This is a list of space-separated percent-encoded uppercase
# characters.
# 2F = /
# 5C = \
# 3A = :
readonly UNSAFE_PERCENT_ENCODE="%2F %5C %3A"

# Whether to invoke curl or not.
DRY_RUN="false"

# Sanitize parameters.
sanitize()
{
    if [ -z "${URLS}" ]; then
        error "You must provide at least one URL to download."
    fi

readonly CURL_OPTIONS URLS DRY_RUN HAS_USER_SET_OUTPUT
}

# Indicate via exit code whether the string given in the first parameter
# consists solely of characters from the string given in the second parameter.
# In other words, it returns 0 if the first parameter only contains characters
# from the second parameter, e.g.: Are $1 characters a subset of $2 characters?
is_subset_of()
{
    case "${1}" in
        *[!${2}]* | '') return 1 ;;
    esac
}

# Indicate via exit code whether the HTML code given in the first
# parameter is safe to be decoded.
is_safe_percent_encode()
{
    upper_str=$(printf "%s" "${1}" | tr "[:lower:]" "[:upper:]")
    for unsafe in ${UNSAFE_PERCENT_ENCODE}; do
        if [ "${unsafe}" = "${upper_str}" ]; then
            return 1
        fi
    done

return 0
}

# Print the given string percent-decoded.
percent_decode()
{
    # Encodings of control characters (00-1F) are passed through without decoding.
    # Iterate on the input character-by-character, decoding it.
    printf "%s\n" "${1}" | fold -w1 | while IFS= read -r decode_out; do
        # If character is a "%", read the next character as decode_hex1.
        if [ "${decode_out}" = % ] && IFS= read -r decode_hex1; then
            decode_out="${decode_out}${decode_hex1}"
            # If there is one more character, read it as decode_hex2.
            if IFS= read -r decode_hex2; then
                decode_out="${decode_out}${decode_hex2}"
                # Skip decoding if this is a control character (00-1F).
                # Skip decoding if DECODE_FILENAME is not "true".
                if [ "${DECODE_FILENAME}" = "true" ] \
                    && is_subset_of "${decode_hex1}" "23456789abcdefABCDEF" \
                    && is_subset_of "${decode_hex2}" "0123456789abcdefABCDEF" \
                    && is_safe_percent_encode "${decode_out}"; then
                    # Use printf to decode it into octal and then decode it to the final format.
                    decode_out="$(printf "%b" "\\$(printf %o "0x${decode_hex1}${decode_hex2}")")"
                fi
            fi
        fi
        printf %s "${decode_out}"
    done
}

# Print the percent-decoded filename portion of the given URL.
get_url_filename()
{
    # Remove protocol and query string if present.
    hostname_and_path="$(printf %s "${1}" | sed -e 's,^[^/]*//,,' -e 's,?.*$,,')"
    # If what remains contains a slash, there is a path; return it percent-decoded.
    case "${hostname_and_path}" in
        # sed to remove everything preceding the last '/', e.g.: "example/something" becomes "something"
        # sed to also replace ':' with the percent_encoded %3A
        */*) percent_decode "$(printf %s "${hostname_and_path}" | sed -e 's,^.*/,,' -e 's,:,%3A,g')" ;;
    esac
    # No slash means there was just a hostname and no path; return empty string.
}

# Execute curl with the list of URLs provided by the user.
exec_curl()
{
    CMD="curl "

# Store version to check if it supports --no-clobber, --parallel and --parallel-max-host.
    curl_version=$($CMD --version | cut -f2 -d' ' | head -n1)
    curl_version_major=$(echo "$curl_version" | cut -f1 -d.)
    curl_version_minor=$(echo "$curl_version" | cut -f2 -d.)

CURL_NO_CLOBBER=""
    CURL_PARALLEL=""

if [ "${curl_version_major}" -ge 8 ]; then
        CURL_NO_CLOBBER="--no-clobber"
        CURL_PARALLEL="--parallel --parallel-max-host 5"

# --parallel-max-host is only supported since 8.16.0.
        if [ "${curl_version_major}" -eq 8 ] && [ "${curl_version_minor}" -lt 16 ]; then
            CURL_PARALLEL="--parallel"
        fi
    elif [ "${curl_version_major}" -eq 7 ]; then
        # --no-clobber is only supported since 7.83.0.
        if [ "${curl_version_minor}" -ge 83 ]; then
            CURL_NO_CLOBBER="--no-clobber"
        fi
        # --parallel is only supported since 7.66.0.
        if [ "${curl_version_minor}" -ge 66 ]; then
            CURL_PARALLEL="--parallel"
        fi
    fi

# Detecting whether we need --parallel. It is easier to rely on
    # the shell's argument parsing.
    # shellcheck disable=SC2086
    set -- $URLS

# If there are less than two URLs, do not set the parallel flag.
    if [ "$#" -lt 2 ]; then
        CURL_PARALLEL=""
    fi

# Start assembling the command.
    #
    # We use 'set --' here (again) because (a) we do not have arrays on
    # POSIX shell, and (b) we need better control over the way we
    # split arguments.
    #
    # shellcheck disable=SC2086
    set -- ${CMD} ${CURL_PARALLEL}

NEXT_PARAMETER=""
    for url in ${URLS}; do
        # If the user did not provide an output path, define one.
        if [ "${HAS_USER_SET_OUTPUT}" = "false" ]; then
            OUTPUT_PATH="$(get_url_filename "${url}")"
            # If we could not get a path from the URL, use the default: index.html.
            [ -z "${OUTPUT_PATH}" ] && OUTPUT_PATH=index.html
        fi
        # shellcheck disable=SC2086
        set -- "$@" ${NEXT_PARAMETER} ${PER_URL_PARAMETERS} ${CURL_NO_CLOBBER} --output "${OUTPUT_PATH}" ${CURL_OPTIONS} "${url}"
        NEXT_PARAMETER="--next"
    done

if [ "${DRY_RUN}" = "false" ]; then
        exec "$@"
    else
        printf "%s\n" "$@"
    fi
}

# Default to decoding the output filename
DECODE_FILENAME="true"

# Use "${1-}" in order to avoid errors because of 'set -u'.
while [ -n "${1-}" ]; do
    case "${1}" in
        --curl-options=*)
            opt=$(printf "%s\n" "${1}" | sed 's/^--curl-options=//')
            CURL_OPTIONS="${CURL_OPTIONS} ${opt}"
            ;;

--curl-options)
            shift
            CURL_OPTIONS="${CURL_OPTIONS} ${1}"
            ;;

--dry-run)
            DRY_RUN="true"
            ;;

--output=*)
            opt=$(printf "%s\n" "${1}" | sed 's/^--output=//')
            HAS_USER_SET_OUTPUT="true"
            OUTPUT_PATH="${opt}"
            ;;

-o | -O | --output)
            shift
            HAS_USER_SET_OUTPUT="true"
            OUTPUT_PATH="${1}"
            ;;

-o* | -O*)
            opt=$(printf "%s\n" "${1}" | sed 's/^-[oO]//')
            HAS_USER_SET_OUTPUT="true"
            OUTPUT_PATH="${opt}"
            ;;

--no-decode-filename)
            DECODE_FILENAME="false"
            ;;

-h | --help)
            usage
            exit 0
            ;;

-V | --version)
            print_version
            exit 0
            ;;

--)
            # This is the start of the list of URLs.
            shift
            for url in "$@"; do
                # Encode whitespace into %20, since wget supports those URLs.
                newurl=$(printf "%s\n" "${url}" | sed 's/ /%20/g')
                URLS="${URLS} ${newurl}"
            done
            break
            ;;

-*)
            error "Unknown option: '$1'."
            ;;

*)
            # This must be a URL.
            # Encode whitespace into %20, since wget supports those URLs.
            newurl=$(printf "%s\n" "${1}" | sed 's/ /%20/g')
            URLS="${URLS} ${newurl}"
            ;;
    esac
    shift
done

sanitize
exec_curl

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