ikiwiki/IkiWiki/Plugin/amazon_s3.pm

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Perl
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#!/usr/bin/perl
package IkiWiki::Plugin::amazon_s3;
use warnings;
no warnings 'redefine';
use strict;
use IkiWiki 3.00;
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use IkiWiki::Render;
use Net::Amazon::S3;
# Store references to real subs before overriding them.
our %subs;
BEGIN {
foreach my $sub (qw{IkiWiki::writefile IkiWiki::prune}) {
$subs{$sub}=\&$sub;
}
};
sub import {
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hook(type => "getopt", id => "amazon_s3", call => \&getopt);
hook(type => "getsetup", id => "amazon_s3", call => \&getsetup);
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hook(type => "checkconfig", id => "amazon_s3", call => \&checkconfig);
}
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sub getopt () {
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eval q{use Getopt::Long};
error($@) if $@;
Getopt::Long::Configure('pass_through');
GetOptions("delete-bucket" => sub {
my $bucket=getbucket();
debug(gettext("deleting bucket.."));
my $resp = $bucket->list_all or die $bucket->err . ": " . $bucket->errstr;
foreach my $key (@{$resp->{keys}}) {
debug("\t".$key->{key});
$bucket->delete_key($key->{key}) or die $bucket->err . ": " . $bucket->errstr;
}
$bucket->delete_bucket or die $bucket->err . ": " . $bucket->errstr;
debug(gettext("done"));
exit(0);
});
}
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sub getsetup () {
return
plugin => {
safe => 0,
rebuild => 0,
},
amazon_s3_key_id => {
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type => "string",
example => "XXXXXXXXXXXXXXXXXXXX",
description => "public access key id",
safe => 1,
rebuild => 0,
},
amazon_s3_key_id => {
type => "string",
example => "$ENV{HOME}/.s3_key",
description => "file holding secret key (must not be readable by others!)",
safe => 0, # ikiwiki reads this file
rebuild => 0,
},
amazon_s3_bucket => {
type => "string",
example => "mywiki",
description => "globally unique name of bucket to store wiki in",
safe => 1,
rebuild => 1,
},
amazon_s3_prefix => {
type => "string",
example => "wiki/",
description => "a prefix to prepend to each page name",
safe => 1,
rebuild => 1,
},
amazon_s3_location => {
type => "string",
example => "EU",
description => "which S3 datacenter to use (leave blank for default)",
safe => 1,
rebuild => 1,
},
amazon_s3_dupindex => {
type => "boolean",
example => 0,
description => "store each index file twice? (allows urls ending in \"/index.html\" and \"/\")",
safe => 1,
rebuild => 1,
},
}
sub checkconfig {
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foreach my $field (qw{amazon_s3_key_id amazon_s3_key_file
amazon_s3_bucket}) {
if (! exists $config{$field} || ! defined $config{$field}) {
error(sprintf(gettext("Must specify %s"), $field));
}
}
if (! exists $config{amazon_s3_prefix} ||
! defined $config{amazon_s3_prefix}) {
$config{amazon_s3_prefix}="wiki/";
}
}
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{
my $bucket;
sub getbucket {
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return $bucket if defined $bucket;
open(IN, "<", $config{amazon_s3_key_file}) || error($config{amazon_s3_key_file}.": ".$!);
my $key=<IN>;
chomp $key;
close IN;
my $s3=Net::Amazon::S3->new({
aws_access_key_id => $config{amazon_s3_key_id},
aws_secret_access_key => $key,
retry => 1,
});
# make sure the bucket exists
if (exists $config{amazon_s3_location}) {
$bucket=$s3->add_bucket({
bucket => $config{amazon_s3_bucket},
location_constraint => $config{amazon_s3_location},
});
}
else {
$bucket=$s3->add_bucket({
bucket => $config{amazon_s3_bucket},
});
}
if (! $bucket) {
# Try to use existing bucket.
$bucket=$s3->bucket($config{amazon_s3_bucket});
}
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if (! $bucket) {
error(gettext("Failed to create S3 bucket: ").
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$s3->err.": ".$s3->errstr."\n");
}
return $bucket;
}
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}
# Given a file, return any S3 keys associated with it.
sub file2keys ($) {
my $file=shift;
my @keys;
if ($file =~ /^\Q$config{destdir}\/\E(.*)/) {
push @keys, $config{amazon_s3_prefix}.$1;
# Munge foo/index.html to foo/
if ($keys[0]=~/(^|.*\/)index.$config{htmlext}$/) {
# A duplicate might need to be stored under the
# unmunged name too.
if (!$config{usedirs} || $config{amazon_s3_dupindex}) {
push @keys, $1;
}
else {
@keys=($1);
}
}
}
return @keys;
}
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package IkiWiki;
use File::MimeInfo;
use Encode;
# This is a wrapper around the real writefile.
sub writefile ($$$;$$) {
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my $file=shift;
my $destdir=shift;
my $content=shift;
my $binary=shift;
my $writer=shift;
# First, write the file to disk.
my $ret=$IkiWiki::Plugin::amazon_s3::subs{'IkiWiki::writefile'}->($file, $destdir, $content, $binary, $writer);
my @keys=IkiWiki::Plugin::amazon_s3::file2keys("$destdir/$file");
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# Store the data in S3.
if (@keys) {
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my $bucket=IkiWiki::Plugin::amazon_s3::getbucket();
# The http layer tries to downgrade utf-8
# content, but that can fail (see
# http://rt.cpan.org/Ticket/Display.html?id=35710),
# so force convert it to bytes.
$content=encode_utf8($content) if defined $content;
my %opts=(
acl_short => 'public-read',
content_type => mimetype("$destdir/$file"),
);
# If there are multiple keys to write, data is sent
# multiple times.
# TODO: investigate using the new copy operation.
# (It may not be robust enough.)
foreach my $key (@keys) {
my $res;
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if (! $writer) {
$res=$bucket->add_key($key, $content, \%opts);
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}
else {
# This test for empty files is a workaround
# for this bug:
# http://rt.cpan.org//Ticket/Display.html?id=35731
if (-z "$destdir/$file") {
$res=$bucket->add_key($key, "", \%opts);
}
else {
# read back in the file that the writer emitted
$res=$bucket->add_key_filename($key, "$destdir/$file", \%opts);
}
}
if (! $res) {
error(gettext("Failed to save file to S3: ").
$bucket->err.": ".$bucket->errstr."\n");
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}
}
}
return $ret;
}
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# This is a wrapper around the real prune.
sub prune ($;$) {
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my $file=shift;
my $up_to=shift;
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my @keys=IkiWiki::Plugin::amazon_s3::file2keys($file);
# Prune files out of S3 too.
if (@keys) {
my $bucket=IkiWiki::Plugin::amazon_s3::getbucket();
foreach my $key (@keys) {
my $res=$bucket->delete_key($key);
if (! $res) {
error(gettext("Failed to delete file from S3: ").
$bucket->err.": ".$bucket->errstr."\n");
}
}
}
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return $IkiWiki::Plugin::amazon_s3::subs{'IkiWiki::prune'}->($file, $up_to);
}
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