feat: Crypt driver, improve http/webdav handling (#4884)

this PR has several enhancements, fixes, and features:
- [x] Crypt: a transparent encryption driver. Anyone can easily, and safely store encrypted data on the remote storage provider.  Consider your data is safely stored in the safe, and the storage provider can only see the safe, but not your data.
  - [x] Optional: compatible with [Rclone Crypt](https://rclone.org/crypt/). More ways to manipulate the encrypted data.
  - [x] directory and filename encryption
  - [x] server-side encryption mode (server encrypts & decrypts all data, all data flows thru the server)
- [x] obfuscate sensitive information internally
- [x] introduced a server memory-cached multi-thread downloader.
  - [x] Driver: **Quark** enabled this feature, faster load in any single thread scenario. e.g. media player directly playing from the link, now it's faster.
- [x] general improvement on HTTP/WebDAV stream processing & header handling & response handling
  - [x] Driver: **Mega** driver support ranged http header
  - [x] Driver: **Quark** fix bug of not closing HTTP request to Quark server while user end has closed connection to alist

## Crypt, a transparent Encrypt/Decrypt Driver. (Rclone Crypt compatible)

e.g.  
Crypt mount path ->  /vault 
Crypt remote path -> /ali/encrypted
Aliyun mount paht -> /ali

when the user uploads a.jpg to /vault, the data will be encrypted and saved to /ali/encrypted/xxxxx. And when the user wants to access a.jpg,  it's automatically decrypted, and the user can do anything with it.
Since it's Rclone Crypt compatible, users can download /ali/encrypted/xxxxx  and decrypt it with rclone crypt tool. Or the user can mount this folder using rclone, then mount the decrypted folder in Linux...

NB.  Some breaking changes is made to make it follow global standard, e.g. processing the HTTP header properly.

close #4679 
close #4827 

Co-authored-by: Sean He <866155+seanhe26@users.noreply.github.com>
Co-authored-by: Andy Hsu <i@nn.ci>

internal/model/args.go

@@ -1,6 +1,7 @@
 package model
 
 import (
+	"github.com/alist-org/alist/v3/pkg/http_range"
 	"io"
 	"net/http"
 	"time"
@@ -19,15 +20,16 @@ type LinkArgs struct {
 }
 
 type Link struct {
-	URL        string         `json:"url"`
-	Header     http.Header    `json:"header"` // needed header (for url) or response header(for data or writer)
-	Data       io.ReadCloser  // return file reader directly
-	Status     int            // status maybe 200 or 206, etc
-	FilePath   *string        // local file, return the filepath
-	Expiration *time.Duration // url expiration time
+	URL             string            `json:"url"`
+	Header          http.Header       `json:"header"` // needed header (for url) or response header(for data or writer)
+	RangeReadCloser RangeReadCloser   // recommended way
+	ReadSeekCloser  io.ReadSeekCloser // best for local,smb.. file system, which exposes ReadSeekCloser
+
+	Expiration *time.Duration // local cache expire Duration
 	IPCacheKey bool           // add ip to cache key
-	//Handle     func(w http.ResponseWriter, r *http.Request) error `json:"-"` // custom handler
-	Writer WriterFunc `json:"-"` // custom writer
+	//for accelerating request, use multi-thread downloading
+	Concurrency int
+	PartSize    int
 }
 
 type OtherArgs struct {
@@ -41,5 +43,10 @@ type FsOtherArgs struct {
 	Method string      `json:"method" form:"method"`
 	Data   interface{} `json:"data" form:"data"`
 }
+type RangeReadCloser struct {
+	RangeReader RangeReaderFunc
+	Closer      io.Closer
+}
 
 type WriterFunc func(w io.Writer) error
+type RangeReaderFunc func(httpRange http_range.Range) (io.ReadCloser, error)

internal/model/obj.go

@@ -21,6 +21,7 @@ type Obj interface {
 	GetName() string
 	ModTime() time.Time
 	IsDir() bool
+	//GetHash() (string, string)
 
 	// The internal information of the driver.
 	// If you want to use it, please understand what it means
@@ -49,6 +50,9 @@ type Thumb interface {
 type SetPath interface {
 	SetPath(path string)
 }
+type SetHash interface {
+	SetHash(hash string, hashType string)
+}
 
 func SortFiles(objs []Obj, orderBy, orderDirection string) {
 	if orderBy == "" {

internal/model/object.go

@@ -29,6 +29,8 @@ type Object struct {
 	Size     int64
 	Modified time.Time
 	IsFolder bool
+	Hash     string
+	HashType string
 }
 
 func (o *Object) GetName() string {
@@ -55,8 +57,17 @@ func (o *Object) GetPath() string {
 	return o.Path
 }
 
-func (o *Object) SetPath(id string) {
-	o.Path = id
+func (o *Object) SetPath(path string) {
+	o.Path = path
+}
+
+func (o *Object) SetHash(hash string, hashType string) {
+	o.Hash = hash
+	o.HashType = hashType
+}
+
+func (o *Object) GetHash() (string, string) {
+	return o.Hash, o.HashType
 }
 
 type Thumbnail struct {