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octokit.sh
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#!/usr/bin/env sh
# # A GitHub API client library written in POSIX sh
#
# https://github.com/whiteinge/ok.sh
# BSD licensed.
#
# ## Requirements
#
# * A POSIX environment (tested against Busybox v1.19.4)
# * curl (tested against 7.32.0)
#
# ## Optional requirements
#
# * jq <http://stedolan.github.io/jq/> (tested against 1.3)
# If jq is not installed commands will output raw JSON; if jq is installed
# the output will be formatted and filtered for use with other shell tools.
#
# ## Setup
#
# Authentication credentials are read from a `$HOME/.netrc` file on UNIX
# machines or a `_netrc` file in `%HOME%` for UNIX environments under Windows.
# [Generate the token on GitHub](https://github.com/settings/tokens) under
# "Account Settings -> Applications".
# Restrict permissions on that file with `chmod 600 ~/.netrc`!
#
# machine api.github.com
# login <username>
# password <token>
#
# machine uploads.github.com
# login <username>
# password <token>
#
# Or set an environment `GITHUB_TOKEN=token`
#
# ## Configuration
#
# The following environment variables may be set to customize ${NAME}.
#
# * OK_SH_URL=${OK_SH_URL}
# Base URL for GitHub or GitHub Enterprise.
# * OK_SH_ACCEPT=${OK_SH_ACCEPT}
# The 'Accept' header to send with each request.
# * OK_SH_JQ_BIN=${OK_SH_JQ_BIN}
# The name of the jq binary, if installed.
# * OK_SH_VERBOSE=${OK_SH_VERBOSE}
# The debug logging verbosity level. Same as the verbose flag.
# * OK_SH_RATE_LIMIT=${OK_SH_RATE_LIMIT}
# Output current GitHub rate limit information to stderr.
# * OK_SH_DESTRUCTIVE=${OK_SH_DESTRUCTIVE}
# Allow destructive operations without prompting for confirmation.
# * OK_SH_MARKDOWN=${OK_SH_MARKDOWN}
# Output some text in Markdown format.
# shellcheck disable=SC2039,SC2220
NAME=$(basename "$0")
export NAME
export VERSION='0.7.0'
export OK_SH_URL=${OK_SH_URL:-'https://api.github.com'}
export OK_SH_ACCEPT=${OK_SH_ACCEPT:-'application/vnd.github.v3+json'}
export OK_SH_JQ_BIN="${OK_SH_JQ_BIN:-jq}"
export OK_SH_VERBOSE="${OK_SH_VERBOSE:-0}"
export OK_SH_RATE_LIMIT="${OK_SH_RATE_LIMIT:-0}"
export OK_SH_DESTRUCTIVE="${OK_SH_DESTRUCTIVE:-0}"
export OK_SH_MARKDOWN="${OK_SH_MARKDOWN:-0}"
# Detect if jq is installed.
command -v "$OK_SH_JQ_BIN" 1>/dev/null 2>/dev/null
NO_JQ=$?
# Customizable logging output.
exec 4>/dev/null
exec 5>/dev/null
exec 6>/dev/null
export LINFO=4 # Info-level log messages.
export LDEBUG=5 # Debug-level log messages.
export LSUMMARY=6 # Summary output.
# Generate a carriage return so we can match on it.
# Using a variable because these are tough to specify in a portable way.
crlf=$(printf '\r\n')
# ## Main
# Generic functions not necessarily specific to working with GitHub.
# ### Help
# Functions for fetching and formatting help text.
_cols() {
sort | awk '
{ w[NR] = $0 }
END {
cols = 3
per_col = sprintf("%.f", NR / cols + 0.5) # Round up if decimal.
for (i = 1; i < per_col + 1; i += 1) {
for (j = 0; j < cols; j += 1) {
printf("%-24s", w[i + per_col * j])
}
printf("\n")
}
}
'
}
_links() { awk '{ print "* [" $0 "](#" $0 ")" }'; }
_funcsfmt() { if [ "$OK_SH_MARKDOWN" -eq 0 ]; then _cols; else _links; fi; }
help() {
# Output the help text for a command
#
# Usage:
#
# help commandname
#
# Positional arguments
#
local fname="$1"
# Function name to search for; if omitted searches whole file.
# Short-circuit if only producing help for a single function.
if [ $# -gt 0 ]; then
awk -v fname="^$fname\\\(\\\) \\\{$" '$0 ~ fname, /^}/ { print }' "$0" \
| _helptext
return
fi
_helptext < "$0"
printf '\n'
help __main
printf '\n'
printf '## Table of Contents\n'
printf '\n### Utility and request/response commands\n\n'
_all_funcs public=0 | _funcsfmt
printf '\n### GitHub commands\n\n'
_all_funcs private=0 | _funcsfmt
printf '\n## Commands\n\n'
for cmd in $(_all_funcs public=0); do
printf '### %s\n\n' "$cmd"
help "$cmd"
printf '\n'
done
for cmd in $(_all_funcs private=0); do
printf '### %s\n\n' "$cmd"
help "$cmd"
printf '\n'
done
}
_all_funcs() {
# List all functions found in the current file in the order they appear
#
# Keyword arguments
#
local public=1
# `0` do not output public functions.
local private=1
# `0` do not output private functions.
for arg in "$@"; do
case $arg in
(public=*) public="${arg#*=}";;
(private=*) private="${arg#*=}";;
esac
done
awk -v public="$public" -v private="$private" '
$1 !~ /^__/ && /^[a-zA-Z0-9_]+\s*\(\)/ {
sub(/\(\)$/, "", $1)
if (!public && substr($1, 1, 1) != "_") next
if (!private && substr($1, 1, 1) == "_") next
print $1
}
' "$0"
}
__main() {
# ## Usage
#
# `${NAME} [<flags>] (command [<arg>, <name=value>...])`
#
# ${NAME} -h # Short, usage help text.
# ${NAME} help # All help text. Warning: long!
# ${NAME} help command # Command-specific help text.
# ${NAME} command # Run a command with and without args.
# ${NAME} command foo bar baz=Baz qux='Qux arg here'
#
# Flag | Description
# ---- | -----------
# -V | Show version.
# -h | Show this screen.
# -j | Output raw JSON; don't process with jq.
# -q | Quiet; don't print to stdout.
# -r | Print current GitHub API rate limit to stderr.
# -v | Logging output; specify multiple times: info, debug, trace.
# -x | Enable xtrace debug logging.
# -y | Answer 'yes' to any prompts.
#
# Flags _must_ be the first argument to `${NAME}`, before `command`.
local cmd
local ret
local opt
local OPTARG
local OPTIND
local quiet=0
local temp_dir
temp_dir="${TMPDIR-/tmp}/${NAME}.${$}.$(awk 'BEGIN {srand(); printf "%d\n", rand() * 10^10}')"
local summary_fifo="${temp_dir}/oksh_summary.fifo"
# shellcheck disable=SC2154
trap '
excode=$?; trap - EXIT;
exec 4>&-
exec 5>&-
exec 6>&-
rm -rf '"$temp_dir"'
exit $excode
' INT TERM EXIT
while getopts Vhjqrvxy opt; do
case $opt in
V) printf 'Version: %s\n' $VERSION
exit;;
h) help __main
printf '\nAvailable commands:\n\n'
_all_funcs private=0 | _cols
printf '\n'
exit;;
j) NO_JQ=1;;
q) quiet=1;;
r) OK_SH_RATE_LIMIT=1;;
v) OK_SH_VERBOSE=$(( OK_SH_VERBOSE + 1 ));;
x) set -x;;
y) OK_SH_DESTRUCTIVE=1;;
esac
done
shift $(( OPTIND - 1 ))
if [ -z "$1" ] ; then
printf 'No command given. Available commands:\n\n%s\n' \
"$(_all_funcs private=0 | _cols)" 1>&2
exit 1
fi
[ $OK_SH_VERBOSE -gt 0 ] && exec 4>&2
[ $OK_SH_VERBOSE -gt 1 ] && exec 5>&2
if [ $quiet -eq 1 ]; then
exec 1>/dev/null 2>/dev/null
fi
if [ "$OK_SH_RATE_LIMIT" -eq 1 ] ; then
mkdir -m 700 "$temp_dir" || {
printf 'failed to create temp_dir\n' >&2; exit 1;
}
mkfifo "$summary_fifo"
# Hold the fifo open so it will buffer input until emptied.
exec 6<>"$summary_fifo"
fi
# Run the command.
cmd="$1" && shift
_log debug "Running command ${cmd}."
"$cmd" "$@"
ret=$?
_log debug "Command ${cmd} exited with ${?}."
# Output any summary messages.
if [ "$OK_SH_RATE_LIMIT" -eq 1 ] ; then
cat "$summary_fifo" 1>&2 &
exec 6>&-
fi
exit $ret
}
_log() {
# A lightweight logging system based on file descriptors
#
# Usage:
#
# _log debug 'Starting the combobulator!'
#
# Positional arguments
#
local level="${1:?Level is required.}"
# The level for a given log message. (info or debug)
local message="${2:?Message is required.}"
# The log message.
shift 2
local lname
case "$level" in
info) lname='INFO'; level=$LINFO ;;
debug) lname='DEBUG'; level=$LDEBUG ;;
*) printf 'Invalid logging level: %s\n' "$level" ;;
esac
printf '%s %s: %s\n' "$NAME" "$lname" "$message" 1>&$level
}
_helptext() {
# Extract contiguous lines of comments and function params as help text
#
# Indentation will be ignored. She-bangs will be ignored. Local variable
# declarations and their default values can also be pulled in as
# documentation. Exits upon encountering the first blank line.
#
# Exported environment variables can be used for string interpolation in
# the extracted commented text.
#
# Input
#
# * (stdin)
# The text of a function body to parse.
awk '
NR != 1 && /^\s*#/ {
line=$0
while(match(line, "[$]{[^}]*}")) {
var=substr(line, RSTART+2, RLENGTH -3)
gsub("[$]{"var"}", ENVIRON[var], line)
}
gsub(/^\s*#\s?/, "", line)
print line
}
/^\s*local/ {
sub(/^\s*local /, "")
sub(/\$\{/, "$", $0)
sub(/:.*}/, "", $0)
print "* `" $0 "`\n"
}
!NF { exit }'
}
# ### Request-response
# Functions for making HTTP requests and processing HTTP responses.
_format_json() {
# Create formatted JSON from name=value pairs
#
# Usage:
# ```
# ok.sh _format_json foo=Foo bar=123 baz=true qux=Qux=Qux quux='Multi-line
# string' quuz=\'5.20170918\' \
# corge="$(ok.sh _format_json grault=Grault)" \
# garply="$(ok.sh _format_json -a waldo true 3)"
# ```
#
# Return:
# ```
# {
# "garply": [
# "waldo",
# true,
# 3
# ],
# "foo": "Foo",
# "corge": {
# "grault": "Grault"
# },
# "baz": true,
# "qux": "Qux=Qux",
# "quux": "Multi-line\nstring",
# "quuz": "5.20170918",
# "bar": 123
# }
# ```
#
# Tries not to quote numbers, booleans, nulls, or nested structures.
# Note, nested structures must be quoted since the output contains spaces.
#
# The `-a` option will create an array instead of an object. This option
# must come directly after the _format_json command and before any
# operands. E.g., `_format_json -a foo bar baz`.
#
# If jq is installed it will also validate the output.
#
# Positional arguments
#
# * $1 - $9
#
# Each positional arg must be in the format of `name=value` which will be
# added to a single, flat JSON object.
local opt
local OPTIND
local is_array=0
local use_env=1
while getopts a opt; do
case $opt in
a) is_array=1; unset use_env;;
esac
done
shift $(( OPTIND - 1 ))
_log debug "Formatting ${#} parameters as JSON."
env -i -- ${use_env+"$@"} awk -v is_array="$is_array" '
function isnum(x){ return (x == x + 0) }
function isnull(x){ return (x == "null" ) }
function isbool(x){ if (x == "true" || x == "false") return 1 }
function isnested(x) {
if (substr(x, 0, 1) == "[" || substr(x, 0, 1) == "{") {
return 1
}
}
function castOrQuote(val) {
if (!isbool(val) && !isnum(val) && !isnull(val) && !isnested(val)) {
sub(/^('\''|")/, "", val) # Remove surrounding quotes
sub(/('\''|")$/, "", val)
gsub(/"/, "\\\"", val) # Escape double-quotes.
gsub(/\n/, "\\n", val) # Replace newlines with \n text.
val = "\"" val "\""
return val
} else {
return val
}
}
BEGIN {
printf("%s", is_array ? "[" : "{")
for (i = 1; i < length(ARGV); i += 1) {
arg = ARGV[i]
if (is_array == 1) {
val = castOrQuote(arg)
printf("%s%s", sep, val)
} else {
name = substr(arg, 0, index(arg, "=") - 1)
val = castOrQuote(ENVIRON[name])
printf("%s\"%s\": %s", sep, name, val)
}
sep = ", "
ARGV[i] = ""
}
printf("%s", is_array ? "]" : "}")
}' "$@"
}
_format_urlencode() {
# URL encode and join name=value pairs
#
# Usage:
# ```
# _format_urlencode foo='Foo Foo' bar='<Bar>&/Bar/'
# ```
#
# Return:
# ```
# foo=Foo%20Foo&bar=%3CBar%3E%26%2FBar%2F
# ```
#
# Ignores pairs if the value begins with an underscore.
_log debug "Formatting ${#} parameters as urlencoded"
env -i -- "$@" awk '
function escape(str, c, i, len, res) {
len = length(str)
res = ""
for (i = 1; i <= len; i += 1) {
c = substr(str, i, 1);
if (c ~ /[0-9A-Za-z]/)
res = res c
else
res = res "%" sprintf("%02X", ord[c])
}
return res
}
BEGIN {
for (i = 0; i <= 255; i += 1) ord[sprintf("%c", i)] = i;
for (j = 1; j < length(ARGV); j += 1) {
arg = ARGV[j]
name = substr(arg, 0, index(arg, "=") - 1)
if (substr(name, 1, 1) == "_") continue
val = ENVIRON[name]
printf("%s%s=%s", sep, name, escape(val))
sep = "&"
ARGV[j] = ""
}
}' "$@"
}
_filter_json() {
# Filter JSON input using jq; outputs raw JSON if jq is not installed
#
# Usage:
#
# printf '[{"foo": "One"}, {"foo": "Two"}]' | \
# ok.sh _filter_json '.[] | "\(.foo)"'
#
# * (stdin)
# JSON input.
local _filter="$1"
# A string of jq filters to apply to the input stream.
_log debug 'Filtering JSON.'
if [ $NO_JQ -ne 0 ] ; then
_log debug 'Bypassing jq processing.'
cat
return
fi
"${OK_SH_JQ_BIN}" -c -r "${_filter}" || printf 'jq parse error; invalid JSON.\n' 1>&2
}
_get_mime_type() {
# Guess the mime type for a file based on the file extension
#
# Usage:
#
# local mime_type
# _get_mime_type "foo.tar"; printf 'mime is: %s' "$mime_type"
#
# Sets the global variable `mime_type` with the result. (If this function
# is called from within a function that has declared a local variable of
# that name it will update the local copy and not set a global.)
#
# Positional arguments
#
local filename="${1:?Filename is required.}"
# The full name of the file, with extension.
# Taken from Apache's mime.types file (public domain).
case "$filename" in
*.bz2) mime_type=application/x-bzip2 ;;
*.exe) mime_type=application/x-msdownload ;;
*.tar.gz | *.gz | *.tgz) mime_type=application/x-gzip ;;
*.jpg | *.jpeg | *.jpe | *.jfif) mime_type=image/jpeg ;;
*.json) mime_type=application/json ;;
*.pdf) mime_type=application/pdf ;;
*.png) mime_type=image/png ;;
*.rpm) mime_type=application/x-rpm ;;
*.svg | *.svgz) mime_type=image/svg+xml ;;
*.tar) mime_type=application/x-tar ;;
*.txt) mime_type=text/plain ;;
*.yaml) mime_type=application/x-yaml ;;
*.apk) mime_type=application/vnd.android.package-archive ;;
*.zip) mime_type=application/zip ;;
*.jar) mime_type=application/java-archive ;;
*.war) mime_type=application/zip ;;
esac
_log debug "Guessed mime type of '${mime_type}' for '${filename}'."
}
_get_confirm() {
# Prompt the user for confirmation
#
# Usage:
#
# local confirm; _get_confirm
# [ "$confirm" -eq 1 ] && printf 'Good to go!\n'
#
# If global confirmation is set via `$OK_SH_DESTRUCTIVE` then the user
# is not prompted. Assigns the user's confirmation to the `confirm` global
# variable. (If this function is called within a function that has a local
# variable of that name, the local variable will be updated instead.)
#
# Positional arguments
#
local message="${1:-Are you sure?}"
# The message to prompt the user with.
local answer
if [ "$OK_SH_DESTRUCTIVE" -eq 1 ] ; then
confirm=$OK_SH_DESTRUCTIVE
return
fi
printf '%s ' "$message"
read -r answer
! printf '%s\n' "$answer" | grep -Eq "$(locale yesexpr)"
confirm=$?
}
_opts_filter() {
# Extract common jq filter keyword options and assign to vars
#
# Usage:
#
# local filter
# _opts_filter "$@"
for arg in "$@"; do
case $arg in
(_filter=*) _filter="${arg#*=}";;
esac
done
}
_opts_pagination() {
# Extract common pagination keyword options and assign to vars
#
# Usage:
#
# local _follow_next
# _opts_pagination "$@"
for arg in "$@"; do
case $arg in
(_follow_next=*) _follow_next="${arg#*=}";;
(_follow_next_limit=*) _follow_next_limit="${arg#*=}";;
esac
done
}
_opts_qs() {
# Extract common query string keyword options and assign to vars
#
# Usage:
#
# local qs
# _opts_qs "$@"
# _get "/some/path${qs}"
local querystring
querystring=$(_format_urlencode "$@")
qs="${querystring:+?$querystring}"
}
_request() {
# A wrapper around making HTTP requests with curl
#
# Usage:
# ```
# # Get JSON for all issues:
# _request /repos/saltstack/salt/issues
#
# # Send a POST request; parse response using jq:
# printf '{"title": "%s", "body": "%s"}\n' "Stuff" "Things" \
# | _request /some/path | jq -r '.[url]'
#
# # Send a PUT request; parse response using jq:
# printf '{"title": "%s", "body": "%s"}\n' "Stuff" "Things" \
# | _request /repos/:owner/:repo/issues method=PUT | jq -r '.[url]'
#
# # Send a conditional-GET request:
# _request /users etag=edd3a0d38d8c329d3ccc6575f17a76bb
# ```
#
# Input
#
# * (stdin)
# Data that will be used as the request body.
#
# Positional arguments
#
local path="${1:?Path is required.}"
# The URL path for the HTTP request.
# Must be an absolute path that starts with a `/` or a full URL that
# starts with http(s). Absolute paths will be append to the value in
# `$OK_SH_URL`.
#
# Keyword arguments
#
local method='GET'
# The method to use for the HTTP request.
local content_type='application/json'
# The value of the Content-Type header to use for the request.
local etag
# An optional Etag to send as the If-None-Match header.
shift 1
local cmd
local arg
local has_stdin
local trace_curl
case $path in
(http*) : ;;
*) path="${OK_SH_URL}${path}" ;;
esac
for arg in "$@"; do
case $arg in
(method=*) method="${arg#*=}";;
(content_type=*) content_type="${arg#*=}";;
(etag=*) etag="${arg#*=}";;
esac
done
case "$method" in
POST | PUT | PATCH) has_stdin=1;;
esac
[ $OK_SH_VERBOSE -eq 3 ] && trace_curl=1
[ "$OK_SH_VERBOSE" -eq 1 ] && set -x
# shellcheck disable=SC2086
curl -nsSig \
-H "Accept: ${OK_SH_ACCEPT}" \
-H "Content-Type: ${content_type}" \
${GITHUB_TOKEN:+-H "Authorization: token ${GITHUB_TOKEN}"} \
${etag:+-H "If-None-Match: \"${etag}\""} \
${has_stdin:+--data-binary @-} \
${trace_curl:+--trace-ascii /dev/stderr} \
-X "${method}" \
"${path}"
set +x
}
_response() {
# Process an HTTP response from curl
#
# Output only headers of interest followed by the response body. Additional
# processing is performed on select headers to make them easier to parse
# using shell tools.
#
# Usage:
# ```
# # Send a request; output the response and only select response headers:
# _request /some/path | _response status_code ETag Link_next
#
# # Make request using curl; output response with select response headers;
# # assign response headers to local variables:
# curl -isS example.com/some/path | _response status_code status_text | {
# local status_code status_text
# read -r status_code
# read -r status_text
# }
# ```
#
# Header reformatting
#
# * HTTP Status
#
# The HTTP line is split into separate `http_version`, `status_code`, and
# `status_text` variables.
#
# * ETag
#
# The surrounding quotes are removed.
#
# * Link
#
# Each URL in the Link header is expanded with the URL type appended to
# the name. E.g., `Link_first`, `Link_last`, `Link_next`.
#
# Positional arguments
#
# * $1 - $9
#
# Each positional arg is the name of an HTTP header. Each header value is
# output in the same order as each argument; each on a single line. A
# blank line is output for headers that cannot be found.
local hdr
local val
local http_version
local status_code=100
local status_text
local headers output
_log debug 'Processing response.'
while [ "${status_code}" = "100" ]; do
read -r http_version status_code status_text
status_text="${status_text%${crlf}}"
http_version="${http_version#HTTP/}"
_log debug "Response status is: ${status_code} ${status_text}"
if [ "${status_code}" = "100" ]; then
_log debug "Ignoring response '${status_code} ${status_text}', skipping to real response."
while IFS=": " read -r hdr val; do
# Headers stop at the first blank line.
[ "$hdr" = "$crlf" ] && break
val="${val%${crlf}}"
_log debug "Unexpected additional header: ${hdr}: ${val}"
done
fi
done
headers="http_version: ${http_version}
status_code: ${status_code}
status_text: ${status_text}
"
while IFS=": " read -r hdr val; do
# Headers stop at the first blank line.
[ "$hdr" = "$crlf" ] && break
val="${val%${crlf}}"
# Process each header; reformat some to work better with sh tools.
case "$hdr" in
# Update the GitHub rate limit trackers.
X-RateLimit-Remaining)
printf 'GitHub remaining requests: %s\n' "$val" 1>&$LSUMMARY ;;
X-RateLimit-Reset)
awk -v gh_reset="$val" 'BEGIN {
srand(); curtime = srand()
print "GitHub seconds to reset: " gh_reset - curtime
}' 1>&$LSUMMARY ;;
# Remove quotes from the etag header.
ETag) val="${val#\"}"; val="${val%\"}" ;;
# Split the URLs in the Link header into separate pseudo-headers.
Link) headers="${headers}$(printf '%s' "$val" | awk '
BEGIN { RS=", "; FS="; "; OFS=": " }
{
sub(/^rel="/, "", $2); sub(/"$/, "", $2)
sub(/^ *</, "", $1); sub(/>$/, "", $1)
print "Link_" $2, $1
}')
" # need trailing newline
;;
esac
headers="${headers}${hdr}: ${val}
" # need trailing newline
done
# Output requested headers in deterministic order.
for arg in "$@"; do
_log debug "Outputting requested header '${arg}'."
output=$(printf '%s' "$headers" | while IFS=": " read -r hdr val; do
[ "$hdr" = "$arg" ] && printf '%s' "$val"
done)
printf '%s\n' "$output"
done
# Output the response body.
cat
}
_get() {
# A wrapper around _request() for common GET patterns
#
# Will automatically follow 'next' pagination URLs in the Link header.
#
# Usage:
#
# _get /some/path
# _get /some/path _follow_next=0
# _get /some/path _follow_next_limit=200 | jq -c .
#
# Positional arguments
#
local path="${1:?Path is required.}"
# The HTTP path or URL to pass to _request().
#
# Keyword arguments
#
# * _follow_next=1
#
# Automatically look for a 'Links' header and follow any 'next' URLs.
#
# * _follow_next_limit=50
#
# Maximum number of 'next' URLs to follow before stopping.
shift 1
local status_code
local status_text
local next_url
# If the variable is unset or empty set it to a default value. Functions
# that call this function can pass these parameters in one of two ways:
# explicitly as a keyword arg or implicitly by setting variables of the same
# names within the local scope.
# shellcheck disable=SC2086
if [ -z ${_follow_next+x} ] || [ -z "${_follow_next}" ]; then
local _follow_next=1
fi
# shellcheck disable=SC2086
if [ -z ${_follow_next_limit+x} ] || [ -z "${_follow_next_limit}" ]; then
local _follow_next_limit=50
fi
_opts_pagination "$@"
_request "$path" | _response status_code status_text Link_next | {
read -r status_code
read -r status_text
read -r next_url
case "$status_code" in
20*) : ;;
4*) printf 'Client Error: %s %s\n' \
"$status_code" "$status_text" 1>&2; exit 1 ;;
5*) printf 'Server Error: %s %s\n' \
"$status_code" "$status_text" 1>&2; exit 1 ;;
esac
# Output response body.
cat
[ "$_follow_next" -eq 1 ] || return
_log info "Remaining next link follows: ${_follow_next_limit}"
if [ -n "$next_url" ] && [ $_follow_next_limit -gt 0 ] ; then
_follow_next_limit=$(( _follow_next_limit - 1 ))
_get "$next_url" "_follow_next_limit=${_follow_next_limit}"
fi
}
}
_post() {
# A wrapper around _request() for common POST / PUT patterns
#
# Usage:
#
# _format_json foo=Foo bar=Bar | _post /some/path
# _format_json foo=Foo bar=Bar | _post /some/path method='PUT'
# _post /some/path filename=somearchive.tar
# _post /some/path filename=somearchive.tar mime_type=application/x-tar
# _post /some/path filename=somearchive.tar \
# mime_type=$(file -b --mime-type somearchive.tar)
#
# Input
#
# * (stdin)
# Optional. See the `filename` argument also.
# Data that will be used as the request body.
#
# Positional arguments
#
local path="${1:?Path is required.}"
# The HTTP path or URL to pass to _request().
#
# Keyword arguments
#
local method='POST'
# The method to use for the HTTP request.
local filename
# Optional. See the `stdin` option above also.
# Takes precedence over any data passed as stdin and loads a file off the
# file system to serve as the request body.
local mime_type
# The value of the Content-Type header to use for the request.
# If the `filename` argument is given this value will be guessed from the
# file extension. If the `filename` argument is not given (i.e., using
# stdin) this value defaults to `application/json`. Specifying this
# argument overrides all other defaults or guesses.
shift 1
for arg in "$@"; do
case $arg in
(method=*) method="${arg#*=}";;
(filename=*) filename="${arg#*=}";;
(mime_type=*) mime_type="${arg#*=}";;
esac
done
# Make either the file or stdin available as fd7.
if [ -n "$filename" ] ; then
if [ -r "$filename" ] ; then
_log debug "Using '${filename}' as POST data."
[ -n "$mime_type" ] || _get_mime_type "$filename"
: ${mime_type:?The MIME type could not be guessed.}
exec 7<"$filename"
else
printf 'File could not be found or read.\n' 1>&2
exit 1
fi
else
_log debug "Using stdin as POST data."
mime_type='application/json'
exec 7<&0
fi
_request "$path" method="$method" content_type="$mime_type" 0<&7 \
| _response status_code status_text \
| {
read -r status_code
read -r status_text
case "$status_code" in
20*) : ;;
4*) printf 'Client Error: %s %s\n' \
"$status_code" "$status_text" 1>&2; exit 1 ;;
5*) printf 'Server Error: %s %s\n' \
"$status_code" "$status_text" 1>&2; exit 1 ;;
esac
# Output response body.
cat
}