shithub: s3

Download patch

ref: 541380f17a9c441d785620a2c83ba78ea4d1261d
author: Jacob Moody <moody@posixcafe.org>
date: Sun Jul 27 22:01:19 EDT 2025 

initial commit just s3cp


--- /dev/null
+++ b/LICENSE
@@ -1,0 +1,7 @@
+Copyright 2025 Jacob Moody
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+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. 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.
--- /dev/null
+++ b/README
@@ -1,0 +1,15 @@
+Basics:
+	Requires $AWS_ACCESS_KEY_ID, $AWS_SECRET_ACCESS_KEY, and $AWS_ENDPOINT_URL_S3 defined
+	Usage: s3cp source s3://<bucket>/destination
+	Usage: s3cp s3://<bucket>/source destination
+
+Specifics/Bugs:
+	Uses webfs(4)
+	$AWS_DEFAULT_REGION is "auto" if not specified
+	Only basic upload/download, no multipart
+	Only AWS4-HMAC-SHA256 support
+	Only tested against Cloudflare R2
+	No direct s3:// → s3://
+	A fs would be better
+	This code sucks
+	No refunds
--- /dev/null
+++ b/mkfile
@@ -1,0 +1,7 @@
+</$objtype/mkfile
+
+BIN=$home/bin/$objtype
+TARG=\
+	s3cp\
+
+</sys/src/cmd/mkmany
--- /dev/null
+++ b/s3cp.c
@@ -1,0 +1,279 @@
+#include <u.h>
+#include <libc.h>
+#include <mp.h>
+#include <libsec.h>
+
+typedef struct {
+	char *endpoint;
+	char *host;
+	char *access;
+	char *secret;
+	char *bucket;
+	char *region;
+} S3;
+
+static void
+datetime(char *date, int ndate, char *time, int ntime)
+{
+	Tm t;
+
+	tmnow(&t, nil);
+	snprint(date, ndate, "%τ", tmfmt(&t, "YYYYMMDD"));
+	snprint(time, ntime, "%sT%τZ", date, tmfmt(&t, "hhmmss"));
+}
+
+#define hmac(data, dlen, key, klen, digest) hmac_sha2_256(data, dlen, key, klen, digest, nil)
+#define hash(data, dlen, digest) sha2_256(data, dlen, digest, nil)
+
+static void
+mkkey(char *key, char *date, char *region, char *service, uchar out[SHA2_256dlen])
+{
+	char buf[256];
+
+	snprint(buf, sizeof buf, "AWS4%s", key);
+	hmac((uchar*)date, strlen(date), (uchar*)buf, strlen(buf), out);
+	hmac((uchar*)region, strlen(region), out, SHA2_256dlen, (uchar*)buf);
+	hmac((uchar*)service, strlen(service), (uchar*)buf, SHA2_256dlen, out);
+	hmac((uchar*)"aws4_request", 12, out, SHA2_256dlen, out);
+}
+
+static void
+prepupload(S3 *s3, int cfd, char *path, uchar hash[SHA2_256dlen], char *mime)
+{
+	char date[64];
+	char time[128];
+	uchar key[SHA2_256dlen], sig[SHA2_256dlen];
+	char buf[512], req[512];
+
+	datetime(date, sizeof date, time, sizeof time);
+
+	snprint(buf, sizeof buf, "content-type:%s\nhost:%s\nx-amz-content-sha256:%.*lH\nx-amz-date:%s\n",
+		mime, s3->host, SHA2_256dlen, hash, time);
+	snprint(req, sizeof req, "PUT\n/%s/%s\n%s\n%s\n%s\n%.*lH",
+		s3->bucket, path, "", buf, "content-type;host;x-amz-content-sha256;x-amz-date", SHA2_256dlen, hash);
+	hash((uchar*)req, strlen(req), key);
+	snprint(buf, sizeof buf, "%s\n%s\n%s/%s/%s/aws4_request\n%.*lH",
+		"AWS4-HMAC-SHA256", time, date, s3->region, "s3", SHA2_256dlen, key);
+	mkkey(s3->secret, date, s3->region, "s3", key);
+	hmac((uchar*)buf, strlen(buf), key, SHA2_256dlen, sig);
+	snprint(buf, sizeof buf, "%s Credential=%s/%s/%s/%s/aws4_request, SignedHeaders=%s, Signature=%.*lH",
+		"AWS4-HMAC-SHA256", s3->access, date, s3->region, "s3", "content-type;host;x-amz-content-sha256;x-amz-date",
+		SHA2_256dlen, sig);
+
+	if(fprint(cfd, "url %s/%s/%s", s3->endpoint, s3->bucket, path) < 0)
+		sysfatal("url: %r");
+	if(fprint(cfd, "request PUT") < 0)
+		sysfatal("request: %r");
+	if(fprint(cfd, "headers Authorization:%s", buf) < 0)
+		sysfatal("headers2: %r");
+	if(fprint(cfd, "headers x-amz-date:%s\nx-amz-content-sha256:%.*lH", time, SHA2_256dlen, hash) < 0)
+		sysfatal("headers: %r");
+	if(fprint(cfd, "contenttype %s", mime) < 0)
+		sysfatal("contenttype: %r");
+}
+
+static void
+prepdownload(S3 *s3, int cfd, char *path)
+{
+	char date[64];
+	char time[128];
+	uchar hash[SHA2_256dlen], key[SHA2_256dlen], sig[SHA2_256dlen];
+	char buf[512], req[512];
+
+	datetime(date, sizeof date, time, sizeof time);
+	hash(nil, 0, hash);
+
+	snprint(buf, sizeof buf, "host:%s\nx-amz-date:%s\n", s3->host, time);
+	snprint(req, sizeof req, "GET\n/%s/%s\n%s\n%s\n%s\n%.*lH",
+		s3->bucket, path, "", buf, "host;x-amz-date", SHA2_256dlen, hash);
+	hash((uchar*)req, strlen(req), key);
+	snprint(buf, sizeof buf, "%s\n%s\n%s/%s/%s/aws4_request\n%.*lH",
+		"AWS4-HMAC-SHA256", time, date, s3->region, "s3", SHA2_256dlen, key);
+	mkkey(s3->secret, date, s3->region, "s3", key);
+	hmac((uchar*)buf, strlen(buf), key, SHA2_256dlen, sig);
+	snprint(buf, sizeof buf, "%s Credential=%s/%s/%s/%s/aws4_request, SignedHeaders=%s, Signature=%.*lH",
+		"AWS4-HMAC-SHA256", s3->access, date, s3->region, "s3", "host;x-amz-date",
+		SHA2_256dlen, sig);
+
+	if(fprint(cfd, "url %s/%s/%s", s3->endpoint, s3->bucket, path) < 0)
+		sysfatal("url: %r");
+	if(fprint(cfd, "headers Authorization:%s", buf) < 0)
+		sysfatal("headers2: %r");
+	if(fprint(cfd, "headers x-amz-date:%s\nx-amz-content-sha256:%.*lH", time, SHA2_256dlen, hash) < 0)
+		sysfatal("headers: %r");
+}
+
+static void
+download(S3 *s3, char *path, char *localpath, int cfd, char *conn)
+{
+	int fd, bfd;
+	long n;
+	char buf[64];
+	char data[8192];
+
+	fd = create(localpath, OWRITE, 0644);
+	if(fd < 0)
+		sysfatal("download create: %r");
+	prepdownload(s3, cfd, path);
+	snprint(buf, sizeof buf, "/mnt/web/%s/body", conn);
+	bfd = open(buf, OREAD);
+	if(bfd < 0)
+		sysfatal("download body: %r");
+	for(;;){
+		n = read(bfd, data, sizeof data);
+		if(n < 0)
+			sysfatal("download body: %r");
+		if(n == 0)
+			return;
+		write(fd, data, n);
+	}
+}
+
+static char*
+mimetype(char *path)
+{
+	int p[2];
+	char buf[256];
+	int n;
+
+	pipe(p);
+	switch(fork()){
+	case 0:
+		close(0);
+		dup(p[0], 1);
+		close(2);
+		close(p[0]);
+		close(p[1]);
+		execl("/bin/file", "file", "-m", path, nil);
+		sysfatal("execl: %r");
+	default:
+		close(p[0]);
+		n = read(p[1], buf, sizeof buf - 1);
+		if(n <= 0)
+			sysfatal("no mimetype found");
+		buf[n - 1] = 0;
+		return strdup(buf);
+	}
+}
+
+static void
+upload(S3 *s3, char *path, char *localpath, int cfd, char *conn)
+{
+	char *mime;
+	DigestState *ds;
+	uchar hash[SHA2_256dlen];
+	uchar data[8192];
+	long n;
+	int fd, bfd;
+	char buf[256];
+
+	mime = mimetype(localpath);
+	fd = open(localpath, OREAD);
+	if(fd < 0)
+		sysfatal("upload open: %r");
+	for(ds = nil;;){
+		n = read(fd, data, sizeof data);
+		if(n < 0)
+			sysfatal("file read: %r");
+		if(n == 0)
+			break;
+		ds = sha2_256(data, n, nil, ds);
+	}
+	sha2_256(nil, 0, hash, ds);
+	seek(fd, 0, 0);
+
+	prepupload(s3, cfd, path, hash, mime);
+	snprint(buf, sizeof buf, "/mnt/web/%s/postbody", conn);
+	bfd = open(buf, OWRITE);
+	if(bfd < 0)
+		sysfatal("upload postbody open: %r");
+	for(;;){
+		n = read(fd, buf, sizeof buf);
+		if(n < 0)
+			sysfatal("file read: %r");
+		if(n == 0)
+			break;
+		if(write(bfd, buf, n) < 0)
+			sysfatal("upload write: %r");
+	}
+	close(bfd);
+
+	snprint(buf, sizeof buf, "/mnt/web/%s/body", conn);
+	if((bfd = open(buf, OREAD)) < 0)
+		sysfatal("open3: %r");
+	close(bfd);
+}
+
+_Noreturn static void
+usage(void)
+{
+	fprint(2, "Requires $AWS_ACCESS_KEY_ID, $AWS_SECRET_ACCESS_KEY, and $AWS_ENDPOINT_URL_S3 defined\n");
+	fprint(2, "Usage: %s source s3://<bucket>/destination\n", argv0);
+	fprint(2, "Usage: %s s3://<bucket>/source destination\n", argv0);
+	exits("usage");
+}
+
+void
+main(int argc , char **argv)
+{
+	S3 s3;
+	int fd;
+	long n;
+	char buf[64];
+	char *p, *path, *localpath;
+	void (*op)(S3*,char*,char*,int,char*);
+
+	tmfmtinstall();
+	fmtinstall('H', encodefmt);
+	ARGBEGIN{
+	default:
+		usage();
+		break;
+	}ARGEND
+	if(argc < 2)
+		usage();
+
+	s3.access = getenv("AWS_ACCESS_KEY_ID");
+	s3.secret = getenv("AWS_SECRET_ACCESS_KEY");
+	s3.endpoint = getenv("AWS_ENDPOINT_URL_S3");
+	s3.region = getenv("AWS_DEFAULT_REGION");
+	if(s3.access == nil || s3.secret == nil || s3.endpoint == nil)
+		usage();
+	if(s3.region == nil)
+		s3.region = "auto";
+
+	s3.host = strstr(s3.endpoint, "://");
+	if(s3.host == nil)
+		sysfatal("invalid endpoint url");
+	s3.host += 3;
+	
+	if(strstr(argv[0], "s3://")==argv[0]){
+		if(strstr(argv[0], "s3://")==argv[1])
+			sysfatal("s3:// → s3:// not implemented");
+		s3.bucket = strdup(argv[0]+5);
+		localpath = strdup(argv[1]);
+		op = download;
+	} else if(strstr(argv[1], "s3://")==argv[1]){
+		localpath = strdup(argv[0]);
+		s3.bucket = strdup(argv[1]+5);
+		op = upload;
+	} else
+		usage();
+
+	p = strchr(s3.bucket, '/');
+	if(p == nil)
+		sysfatal("no path provided within bucket");
+	*p = 0;
+	path = p+1;
+
+	fd = open("/mnt/web/clone", ORDWR);
+	if(fd < 0)
+		sysfatal("open: %r");
+	n = read(fd, buf, sizeof buf - 1);
+	if(n <= 0)
+		sysfatal("read: %r");
+	buf[n-1] = 0;
+
+	op(&s3, path, localpath, fd, buf);
+	exits(nil);
+}
-- 
⑨