gateway: use core api for serving GET/HEAD/POST

core/coreapi/coreapi.go

@@ -0,0 +1,26 @@
+package coreapi
+
+import (
+	"context"
+
+	core "github.com/ipfs/go-ipfs/core"
+	coreiface "github.com/ipfs/go-ipfs/core/coreapi/interface"
+	path "github.com/ipfs/go-ipfs/path"
+
+	ipld "gx/ipfs/QmU7bFWQ793qmvNy7outdCaMfSDNk8uqhx4VNrxYj5fj5g/go-ipld-node"
+)
+
+func resolve(ctx context.Context, n *core.IpfsNode, p string) (ipld.Node, error) {
+	pp, err := path.ParsePath(p)
+	if err != nil {
+		return nil, err
+	}
+
+	dagnode, err := core.Resolve(ctx, n.Namesys, n.Resolver, pp)
+	if err == core.ErrNoNamesys {
+		return nil, coreiface.ErrOffline
+	} else if err != nil {
+		return nil, err
+	}
+	return dagnode, nil
+}

core/coreapi/interface/interface.go

@@ -0,0 +1,54 @@
+package iface
+
+import (
+	"context"
+	"errors"
+	"io"
+
+	ipld "gx/ipfs/QmU7bFWQ793qmvNy7outdCaMfSDNk8uqhx4VNrxYj5fj5g/go-ipld-node"
+	cid "gx/ipfs/QmXfiyr2RWEXpVDdaYnD2HNiBk6UBddsvEP4RPfXb6nGqY/go-cid"
+)
+
+// type CoreAPI interface {
+// 	ID() CoreID
+// 	Version() CoreVersion
+// }
+
+type Link ipld.Link
+
+type Reader interface {
+	io.ReadSeeker
+	io.Closer
+}
+
+type UnixfsAPI interface {
+	Add(context.Context, io.Reader) (*cid.Cid, error)
+	Cat(context.Context, string) (Reader, error)
+	Ls(context.Context, string) ([]*Link, error)
+}
+
+// type ObjectAPI interface {
+// 	New() (cid.Cid, Object)
+// 	Get(string) (Object, error)
+// 	Links(string) ([]*Link, error)
+// 	Data(string) (Reader, error)
+// 	Stat(string) (ObjectStat, error)
+// 	Put(Object) (cid.Cid, error)
+// 	SetData(string, Reader) (cid.Cid, error)
+// 	AppendData(string, Data) (cid.Cid, error)
+// 	AddLink(string, string, string) (cid.Cid, error)
+// 	RmLink(string, string) (cid.Cid, error)
+// }
+
+// type ObjectStat struct {
+// 	Cid            cid.Cid
+// 	NumLinks       int
+// 	BlockSize      int
+// 	LinksSize      int
+// 	DataSize       int
+// 	CumulativeSize int
+// }
+
+var ErrIsDir = errors.New("object is a directory")
+var ErrIsNonDag = errors.New("not a merkledag object")
+var ErrOffline = errors.New("can't resolve, ipfs node is offline")

core/coreapi/unixfs.go

@@ -0,0 +1,59 @@
+package coreapi
+
+import (
+	"context"
+	"io"
+
+	core "github.com/ipfs/go-ipfs/core"
+	coreiface "github.com/ipfs/go-ipfs/core/coreapi/interface"
+	coreunix "github.com/ipfs/go-ipfs/core/coreunix"
+	uio "github.com/ipfs/go-ipfs/unixfs/io"
+
+	cid "gx/ipfs/QmXfiyr2RWEXpVDdaYnD2HNiBk6UBddsvEP4RPfXb6nGqY/go-cid"
+)
+
+type UnixfsAPI struct {
+	node *core.IpfsNode
+}
+
+func NewUnixfsAPI(n *core.IpfsNode) coreiface.UnixfsAPI {
+	api := &UnixfsAPI{n}
+	return api
+}
+
+func (api *UnixfsAPI) Add(ctx context.Context, r io.Reader) (*cid.Cid, error) {
+	k, err := coreunix.AddWithContext(ctx, api.node, r)
+	if err != nil {
+		return nil, err
+	}
+	return cid.Decode(k)
+}
+
+func (api *UnixfsAPI) Cat(ctx context.Context, p string) (coreiface.Reader, error) {
+	dagnode, err := resolve(ctx, api.node, p)
+	if err != nil {
+		return nil, err
+	}
+
+	r, err := uio.NewDagReader(ctx, dagnode, api.node.DAG)
+	if err == uio.ErrIsDir {
+		return nil, coreiface.ErrIsDir
+	} else if err != nil {
+		return nil, err
+	}
+	return r, nil
+}
+
+func (api *UnixfsAPI) Ls(ctx context.Context, p string) ([]*coreiface.Link, error) {
+	dagnode, err := resolve(ctx, api.node, p)
+	if err != nil {
+		return nil, err
+	}
+
+	l := dagnode.Links()
+	links := make([]*coreiface.Link, len(l))
+	for i, l := range l {
+		links[i] = &coreiface.Link{l.Name, l.Size, l.Cid}
+	}
+	return links, nil
+}