.github/ISSUE_TEMPLATE/config.yml

+blank_issues_enabled: false
+contact_links:
+ - name: Getting Help on IPFS
+   url: https://ipfs.io/help
+   about: All information about how and where to get help on IPFS.
+ - name: IPFS Official Forum
+   url: https://discuss.ipfs.io
+   about: Please post general questions, support requests, and discussions here.

.github/ISSUE_TEMPLATE/open_an_issue.md

+---
+name: Open an issue
+about: Only for actionable issues relevant to this repository.
+title: ''
+labels: need/triage
+assignees: ''
+
+---
+<!--
+Hello! To ensure this issue is correctly addressed as soon as possible by the IPFS team, please try to make sure:
+
+- This issue is relevant to this repository's topic or codebase.
+
+- A clear description is provided. It should includes as much relevant information as possible and clear scope for the issue to be actionable.
+
+FOR GENERAL DISCUSSION, HELP OR QUESTIONS, please see the options at https://ipfs.io/help or head directly to https://discuss.ipfs.io.
+
+(you can delete this section after reading)
+-->

.github/config.yml

+# Configuration for welcome - https://github.com/behaviorbot/welcome
+
+# Configuration for new-issue-welcome - https://github.com/behaviorbot/new-issue-welcome
+# Comment to be posted to on first time issues
+newIssueWelcomeComment: >
+  Thank you for submitting your first issue to this repository! A maintainer
+  will be here shortly to triage and review.
+
+  In the meantime, please double-check that you have provided all the
+  necessary information to make this process easy! Any information that can
+  help save additional round trips is useful! We currently aim to give
+  initial feedback within **two business days**. If this does not happen, feel
+  free to leave a comment.
+
+  Please keep an eye on how this issue will be labeled, as labels give an
+  overview of priorities, assignments and additional actions requested by the
+  maintainers:
+
+    - "Priority" labels will show how urgent this is for the team.
+    - "Status" labels will show if this is ready to be worked on, blocked, or in progress.
+    - "Need" labels will indicate if additional input or analysis is required.
+
+  Finally, remember to use https://discuss.ipfs.io if you just need general
+  support.
+
+# Configuration for new-pr-welcome - https://github.com/behaviorbot/new-pr-welcome
+# Comment to be posted to on PRs from first time contributors in your repository
+newPRWelcomeComment: >
+  Thank you for submitting this PR!
+
+  A maintainer will be here shortly to review it.
+
+  We are super grateful, but we are also overloaded! Help us by making sure
+  that:
+
+    * The context for this PR is clear, with relevant discussion, decisions
+      and stakeholders linked/mentioned.
+
+    * Your contribution itself is clear (code comments, self-review for the
+      rest) and in its best form. Follow the [code contribution
+      guidelines](https://github.com/ipfs/community/blob/master/CONTRIBUTING.md#code-contribution-guidelines)
+      if they apply.
+
+  Getting other community members to do a review would be great help too on
+  complex PRs (you can ask in the chats/forums). If you are unsure about
+  something, just leave us a comment.
+
+  Next steps:
+
+    * A maintainer will triage and assign priority to this PR, commenting on
+      any missing things and potentially assigning a reviewer for high
+      priority items.
+
+    * The PR gets reviews, discussed and approvals as needed.
+
+    * The PR is merged by maintainers when it has been approved and comments addressed.
+
+  We currently aim to provide initial feedback/triaging within **two business
+  days**. Please keep an eye on any labelling actions, as these will indicate
+  priorities and status of your contribution.
+
+  We are very grateful for your contribution!
+
+
+# Configuration for first-pr-merge - https://github.com/behaviorbot/first-pr-merge
+# Comment to be posted to on pull requests merged by a first time user
+# Currently disabled
+#firstPRMergeComment: ""

.gitlab-ci.yml

+stages:
+  - build
+  - test
+
+variables:
+  BUILD_DIR: "/tmp/$CI_CONCURRENT_PROJECT_ID"
+
+before_script:
+  - mkdir -p $BUILD_DIR/src
+  - cd $BUILD_DIR/src
+  - if [ -d $CI_PROJECT_DIR ]
+  - then
+  -    echo "soft link $CI_PROJECT_DIR exists"
+  - else
+  -    echo "creating soft link $CI_PROJECT_DIR"
+  -    ln -s $CI_PROJECT_DIR
+  - fi
+  - cd $CI_PROJECT_DIR
+
+build:
+  stage: build
+  tags:
+    - testing
+  script:
+    - echo $CI_JOB_STAGE
+    - go build
+
+test:
+  stage: test
+  tags:
+    - testing
+  script:
+    - echo $CI_JOB_STAGE
+    - go test -cover
+  coverage: '/coverage: \d+.\d+% of statements/'

.gx/lastpubver

+0.2.2: QmYYLnAzR28nAQ4U5MFniLprnktu6eTFKibeNt96V21EZK

.travis.yml

+os:
+  - linux
+
+language: go
+
+go:
+  - 1.11.x
+
+env:
+  global:
+    - GOTFLAGS="-race"
+  matrix:
+    - BUILD_DEPTYPE=gomod
+
+
+# disable travis install
+install:
+  - true
+
+script:
+  - bash <(curl -s https://raw.githubusercontent.com/ipfs/ci-helpers/master/travis-ci/run-standard-tests.sh)
+
+
+cache:
+  directories:
+    - $GOPATH/pkg/mod
+    - $HOME/.cache/go-build
+
+notifications:
+  email: false

LICENSE

+The MIT License (MIT)
+
+Copyright (c) 2014-2017 Juan Batiz-Benet
+
+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.

Makefile

+gx:
+	go get github.com/whyrusleeping/gx
+	go get github.com/whyrusleeping/gx-go
+
+covertools:
+	go get github.com/mattn/goveralls
+	go get golang.org/x/tools/cmd/cover
+
+deps: gx covertools
+	gx --verbose install --global
+	gx-go rewrite
+
+publish:
+	gx-go rewrite --undo
+

README.md

-# go-block-format
+go-block-format
+==================
 
-dms3 block format
+[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
\ No newline at end of file
+[![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](http://ipfs.io/)
+[![](https://img.shields.io/badge/freenode-%23ipfs-blue.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23ipfs)
+[![Coverage Status](https://codecov.io/gh/ipfs/go-block-format/branch/master/graph/badge.svg)](https://codecov.io/gh/ipfs/go-block-format/branch/master)
+[![Travis CI](https://travis-ci.org/ipfs/go-block-format.svg?branch=master)](https://travis-ci.org/ipfs/go-block-format)
+
+> go-block-format is a set of interfaces that a type needs to implement in order to be a CID addressable block of data.
+
+## Lead Maintainer
+
+[Eric Myhre](https://github.com/warpfork)
+
+## Table of Contents
+
+- [Install](#install)
+- [Usage](#usage)
+- [API](#api)
+- [Contribute](#contribute)
+- [License](#license)
+
+## Install
+
+```sh
+make install
+```
+
+## Contribute
+
+PRs are welcome!
+
+Small note: If editing the Readme, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
+
+## License
+
+MIT © Juan Batiz-Benet

blocks.go

+// Package blocks contains the lowest level of DMS3LD data structures.
+// A block is raw data accompanied by a CID. The CID contains the multihash
+// corresponding to the block.
+package blocks
+
+import (
+	"errors"
+	"fmt"
+
+	mh "github.com/multiformats/go-multihash"
+	cid "gitlab.dms3.io/dms3/public/go-cid"
+	u "gitlab.dms3.io/dms3/public/go-dms3-util"
+)
+
+// ErrWrongHash is returned when the Cid of a block is not the expected
+// according to the contents. It is currently used only when debugging.
+var ErrWrongHash = errors.New("data did not match given hash")
+
+// Block provides abstraction for blocks implementations.
+type Block interface {
+	RawData() []byte
+	Cid() cid.Cid
+	String() string
+	Loggable() map[string]interface{}
+}
+
+// A BasicBlock is a singular block of data in dms3. It implements the Block
+// interface.
+type BasicBlock struct {
+	cid  cid.Cid
+	data []byte
+}
+
+// NewBlock creates a Block object from opaque data. It will hash the data.
+func NewBlock(data []byte) *BasicBlock {
+	// TODO: fix assumptions
+	return &BasicBlock{data: data, cid: cid.NewCidV0(u.Hash(data))}
+}
+
+// NewBlockWithCid creates a new block when the hash of the data
+// is already known, this is used to save time in situations where
+// we are able to be confident that the data is correct.
+func NewBlockWithCid(data []byte, c cid.Cid) (*BasicBlock, error) {
+	if u.Debug {
+		chkc, err := c.Prefix().Sum(data)
+		if err != nil {
+			return nil, err
+		}
+
+		if !chkc.Equals(c) {
+			return nil, ErrWrongHash
+		}
+	}
+	return &BasicBlock{data: data, cid: c}, nil
+}
+
+// Multihash returns the hash contained in the block CID.
+func (b *BasicBlock) Multihash() mh.Multihash {
+	return b.cid.Hash()
+}
+
+// RawData returns the block raw contents as a byte slice.
+func (b *BasicBlock) RawData() []byte {
+	return b.data
+}
+
+// Cid returns the content identifier of the block.
+func (b *BasicBlock) Cid() cid.Cid {
+	return b.cid
+}
+
+// String provides a human-readable representation of the block CID.
+func (b *BasicBlock) String() string {
+	return fmt.Sprintf("[Block %s]", b.Cid())
+}
+
+// Loggable returns a go-log loggable item.
+func (b *BasicBlock) Loggable() map[string]interface{} {
+	return map[string]interface{}{
+		"block": b.Cid().String(),
+	}
+}

blocks_test.go

+package blocks
+
+import (
+	"bytes"
+	"testing"
+
+	mh "github.com/multiformats/go-multihash"
+	cid "gitlab.dms3.io/dms3/public/go-cid"
+	u "gitlab.dms3.io/dms3/public/go-dms3-util"
+)
+
+func TestBlocksBasic(t *testing.T) {
+
+	// Test empty data
+	empty := []byte{}
+	NewBlock(empty)
+
+	// Test nil case
+	NewBlock(nil)
+
+	// Test some data
+	NewBlock([]byte("Hello world!"))
+}
+
+func TestData(t *testing.T) {
+	data := []byte("some data")
+	block := NewBlock(data)
+
+	if !bytes.Equal(block.RawData(), data) {
+		t.Error("data is wrong")
+	}
+}
+
+func TestHash(t *testing.T) {
+	data := []byte("some other data")
+	block := NewBlock(data)
+
+	hash, err := mh.Sum(data, mh.SHA2_256, -1)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if !bytes.Equal(block.Multihash(), hash) {
+		t.Error("wrong multihash")
+	}
+}
+
+func TestCid(t *testing.T) {
+	data := []byte("yet another data")
+	block := NewBlock(data)
+	c := block.Cid()
+
+	if !bytes.Equal(block.Multihash(), c.Hash()) {
+		t.Error("key contains wrong data")
+	}
+}
+
+func TestManualHash(t *testing.T) {
+	oldDebugState := u.Debug
+	defer (func() {
+		u.Debug = oldDebugState
+	})()
+
+	data := []byte("I can't figure out more names .. data")
+	hash, err := mh.Sum(data, mh.SHA2_256, -1)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	c := cid.NewCidV0(hash)
+
+	u.Debug = false
+	block, err := NewBlockWithCid(data, c)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if !bytes.Equal(block.Multihash(), hash) {
+		t.Error("wrong multihash")
+	}
+
+	data[5] = byte((uint32(data[5]) + 5) % 256) // Transfrom hash to be different
+	block, err = NewBlockWithCid(data, c)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if !bytes.Equal(block.Multihash(), hash) {
+		t.Error("wrong multihash")
+	}
+
+	u.Debug = true
+
+	_, err = NewBlockWithCid(data, c)
+	if err != ErrWrongHash {
+		t.Fatal(err)
+	}
+}

codecov.yml

+coverage:
+  range: "50...100"
+comment: off

go.mod

+module gitlab.dms3.io/dms3/public/go-block-format
+
+go 1.15
+
+require (
+	gitlab.dms3.io/dms3/public/go-cid v0.0.1
+	gitlab.dms3.io/dms3/public/go-dms3-util v0.0.1
+	github.com/multiformats/go-multihash v0.0.14
+)

go.sum

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