add option to store markdown backups elsewhere

`--md-hist` / volflag `md_hist` specifies where to put old
versions of markdown files when edited using the web-ui;

* `s` = create `.hist` subfolder next to the markdown file
   (the default, both previously and now)

* `v` = use the volume's hist-path, either according to
   `--hist` or the `hist` volflag. NOTE: old versions
   will not be retrievable through the web-ui

* `n` = nope / disabled; overwrite without backup

copyparty/__main__.py

@@ -1431,6 +1431,7 @@ def add_db_metadata(ap):
 
 def add_txt(ap):
     ap2 = ap.add_argument_group('textfile options')
+    ap2.add_argument("--md-hist", metavar="TXT", type=u, default="s", help="where to store old version of markdown files; [\033[32ms\033[0m]=subfolder, [\033[32mv\033[0m]=volume-histpath, [\033[32mn\033[0m]=nope/disabled (volflag=md_hist)")
     ap2.add_argument("-mcr", metavar="SEC", type=int, default=60, help="the textfile editor will check for serverside changes every \033[33mSEC\033[0m seconds")
     ap2.add_argument("-emp", action="store_true", help="enable markdown plugins -- neat but dangerous, big XSS risk")
     ap2.add_argument("--exp", action="store_true", help="enable textfile expansion -- replace {{self.ip}} and such; see \033[33m--help-exp\033[0m (volflag=exp)")

copyparty/cfg.py

@@ -83,6 +83,7 @@ def vf_vmap() -> dict[str, str]:
         "md_sbf",
         "lg_sba",
         "md_sba",
+        "md_hist",
         "nrand",
         "u2ow",
         "og_desc",
@@ -291,6 +292,7 @@ flagcats = {
         "og_ua": "if defined: only send OG html if useragent matches this regex",
     },
     "textfiles": {
+        "md_hist": "where to put markdown backups; s=subfolder, v=volHist, n=nope",
         "exp": "enable textfile expansion; see --help-exp",
         "exp_md": "placeholders to expand in markdown files; see --help",
         "exp_lg": "placeholders to expand in prologue/epilogue; see --help",

copyparty/httpcli.py

@@ -57,6 +57,7 @@ from .util import (
     UnrecvEOF,
     WrongPostKey,
     absreal,
+    afsenc,
     alltrace,
     atomic_move,
     b64dec,
@@ -3501,6 +3502,7 @@ class HttpCli(object):
 
         fp = os.path.join(fp, fn)
         rem = "{}/{}".format(rp, fn).strip("/")
+        dbv, vrem = vfs.get_dbv(rem)
 
         if not rem.endswith(".md") and not self.can_delete:
             raise Pebkac(400, "only markdown pls")
@@ -3555,13 +3557,27 @@ class HttpCli(object):
             mdir, mfile = os.path.split(fp)
             fname, fext = mfile.rsplit(".", 1) if "." in mfile else (mfile, "md")
             mfile2 = "{}.{:.3f}.{}".format(fname, srv_lastmod, fext)
-            try:
+
+            dp = ""
+            hist_cfg = dbv.flags["md_hist"]
+            if hist_cfg == "v":
+                vrd = vsplit(vrem)[0]
+                zb = hashlib.sha512(afsenc(vrd)).digest()
+                zs = ub64enc(zb).decode("ascii")[:24].lower()
+                dp = "%s/md/%s/%s/%s" % (dbv.histpath, zs[:2], zs[2:4], zs)
+                self.log("moving old version to %s/%s" % (dp, mfile2))
+                if bos.makedirs(dp):
+                    with open(os.path.join(dp, "dir.txt"), "wb") as f:
+                        f.write(afsenc(vrd))
+            elif hist_cfg == "s":
                 dp = os.path.join(mdir, ".hist")
+                try:
                     bos.mkdir(dp)
                     hidedir(dp)
                 except:
                     pass
-            wrename(self.log, fp, os.path.join(mdir, ".hist", mfile2), vfs.flags)
+            if dp:
+                wrename(self.log, fp, os.path.join(dp, mfile2), vfs.flags)
 
         assert self.parser.gen  # !rm
         p_field, _, p_data = next(self.parser.gen)
@@ -3634,13 +3650,12 @@ class HttpCli(object):
             wunlink(self.log, fp, vfs.flags)
             raise Pebkac(403, t)
 
-        vfs, rem = vfs.get_dbv(rem)
         self.conn.hsrv.broker.say(
             "up2k.hash_file",
-            vfs.realpath,
-            vfs.vpath,
-            vfs.flags,
-            vsplit(rem)[0],
+            dbv.realpath,
+            dbv.vpath,
+            dbv.flags,
+            vsplit(vrem)[0],
             fn,
             self.ip,
             new_lastmod,
@@ -6020,9 +6035,11 @@ class HttpCli(object):
         # check for old versions of files,
         # [num-backups, most-recent, hist-path]
         hist: dict[str, tuple[int, float, str]] = {}
+        try:
+            if vf["md_hist"] != "s":
+                raise Exception()
             histdir = os.path.join(fsroot, ".hist")
             ptn = RE_MDV
-        try:
             for hfn in bos.listdir(histdir):
                 m = ptn.match(hfn)
                 if not m:

tests/util.py

@@ -174,6 +174,7 @@ class Cfg(Namespace):
             lang="eng",
             log_badpwd=1,
             logout=573,
+            md_hist="s",
             mte={"a": True},
             mth={},
             mtp=[],