Blockchain interactions in Ara modules.

This repository contains all contracts deployed by Ara. There are five global contracts used throughout the entire network:

1. AraToken.sol - The Ara ERC20 token contract

2. AFS.sol - The AFS standard contract defines the API for interacting with AFSs on the blockchain (see the accompanying RFC). The current AFS Standard version is 4. Future Standards are not necessarily sequential or superseding in nature and may exist in parallel (e.g., another AFS Standard may be named ecommerce which can be used for an entirely different class of AFSs). In order to estimate costs for interacting with the Standard without needing to deploy a proxy beforehand, we additionally deploy a version of all AFS Standards without modifiers which are named ${version name}_estimate. The current AFS Estimate Standard version is 4_estimate.

3. Library.sol - The contract where content ownership across the network is consolidated and tracked

4. Registry.sol - The contract where AFS proxies and AFS standards are created, linked, and tracked

5. AraRegistry.sol - The contract used to deploy the Library, Registry, and AraToken contracts

This repository also provides programmatic (see the API section) and command-line interfaces (see the Usage section) for interacting with the contracts.

In addition to these global contracts, Ara deploys a proxy contract for each individual AFS that gets committed to the blockchain (see ara-filesystem and proxy architecture). This contract serves as the storage layer for AFSs on the blockchain, while the AFS Standard serves as the API (business logic layer) for interacting with AFSs on the blockchain.

Stability: 2 - Stable. Compatibility with the npm ecosystem is a high priority.

Although the API is stable, this project is still in alpha development and is not yet ready to be used in a production environment.

• Node
• Truffle

$ npm install arablocks/ara-contracts --save

See CLI Usage docs here.

The contracts in this repository are currently deployed on Ara Privatenet and Ethereum Ropsten Testnet. You must be connected to one of these networks in order to be on the same network as the rest of the Ara team during development and to use the addresses in constants.js. You may run a local Ganache instance for local development.

Any value inputted into token functions must be strings to avoid precision error All transaction callbacks (onhash, onreceipt, onconfirmation, onerror, and onmined) are optional. For more information, see ara-util.

• purchase(opts)

• async registry.proxyExists(contentDid)
• async registry.getProxyAddress(contentDid)
• async registry.upgradeProxy(opts)
• async registry.deployProxy(opts)
• async registry.getProxyVersion(contentDid)
• async registry.getLatestStandard()
• async registry.getStandard(version)
• async registry.deployNewStandard(opts)

• async library.getLibrary(requesterDid)
• async library.getLibrarySize(requesterDid)
• async library.getLibraryItem(opts)
• async library.hasPurchased(opts)

• async rewards.submit(opts)
• async rewards.allocate(opts)
• async rewards.redeem(opts)
• async rewards.getBudget(opts)
• async rewards.getJobOwner(opts)
• async rewards.getRewardsBalance(opts)

• async token.balanceOf(did, keyringOpts)
• async token.totalSupply()
• async token.allowance(opts)
• async token.transfer(opts)
• async token.approve(opts)
• async token.transferFrom(opts)
• async token.increaseApproval(opts)
• async token.decreaseApproval(opts)
• async token.modifyDeposit(opts)
• async token.getAmountDeposited(did, keyringOpts)
• token.constrainTokenValue(val)
• token.expandTokenValue(val)

• async ownership.approveOwnershipTransfer(opts)
• async ownership.revokeOwnershipRequest(opts)
• async ownership.requestOwnership(opts)
• async ownership.hasRequested(opts)
• async ownership.getOwner(contentDid)

Purchases an AFS and adds it to the requester's library.

• opts
  • requesterDid - The DID of the person making the purchase
  • contentDid - The DID of the content being purchased
  • password - The requester's password
  • budget - The budget in Ara to allocate for the initial download job
  • gasPrice - Optional gas price in GWei
  • approve - Optional boolean indicating whether to send the Approve transaction prior to the Purchase transaction
  • keyringOpts - Optional keyring options
  • approveCallbacks - Optional callbacks for the Approve transaction
    • onhash
    • onreceipt
    • onconfirmation
    • onerror
    • onmined
  • purchaseCallbacks - Optional callbacks for the Purchase transaction
    • onhash
    • onreceipt
    • onconfirmation
    • onerror
    • onmined

Returns object:

• receipt - Transaction receipt
• jobId - The job ID generated for the initial download

const requesterDid = 'did:ara:a51aa651c5a28a7c0a8de007843a00dcd24f3cc893522d3fb093c2bb7a323785'
const contentDid = 'did:ara:114045f3883a21735188bb02de024a4e1451cb96c5dcc80bdfa1b801ecf81b85'
const budget = 100
const { receipt, jobId } = await purchase({
  requesterDid,
  contentDid,
  password,
  budget
})

Checks if the proxy for a content DID exists.

• contentDid - The DID of the content to check

Returns a boolean indicating whether a proxy contract exists for a contentDid.

const exists = await registry.proxyExists(contentDid)

Gets the address of a proxy given a content DID

• contentDid - The DID of the content

const address = await registry.getProxyAddress(contentDid)

Upgrades a proxy to another AFS standard.

• opts
  • contentDid - The DID of the content
  • password - The password of the owner of the proxy
  • afsPassword - The password of the AFS
  • version - The AFS standard version to upgrade to
  • gasPrice - Optional gas price in GWei
  • keyringOpts - Optional keyring options
  • onhash
  • onreceipt
  • onconfirmation
  • onerror
  • onmined

Returns a boolean indicating whether the proxy was successfully upgraded.

const upgraded = await registry.upgradeProxy({ contentDid, password, afsPassword, version: '1' })

Deploys a proxy to an AFS standard.

• opts
  • contentDid - The DID of the content to deploy a proxy for
  • password - The password of the owner of the AFS
  • afsPassword - The password of the AFS
  • version - The version to use with this proxy
  • estimate - Optional flag to check cost of deployProxy
  • ownerDid - Optional owner DID used in conjunction with estimate to bypass needing a real AFS
  • gasPrice - Optional gas price in GWei
  • keyringOpts - Optional keyring options
  • onhash
  • onreceipt
  • onconfirmation
  • onerror
  • onmined

Returns the address at which the proxy was deployed.

const address = await registry.deployProxy({ contentDid, password, afsPassword, version: '1' })

Gets the AFS Standard version a proxy is using.

• contentDid - The DID of the content

const version = await registry.getProxyVersion(contentDid)

Gets the latest AFS contract standard.

const address = await registry.getLatestStandard()

Gets the address of an AFS contract standard.

• version - The version of the AFS contract standard

const address = await registry.getStandard('1')

Compiles and deploys a new AFS standard.

• opts
  • requesterDid - The DID of the person deploying the standard
  • password - The password of the person deploying the standard
  • version - The version of the standard
  • paths - The solidity dependencies of the standard
  • gasPrice - Optional gas price in GWei
  • keyringOpts - Optional keyring options
  • onhash
  • onreceipt
  • onconfirmation
  • onerror
  • onmined

Returns the address at which the standard was deployed.

const version = '1'
const paths = ['./contracts/ignored_contracts/AFS.sol',
               './contracts/ignored_contracts/Library.sol',
               './contracts/ignored_contracts/Registry.sol',
               './contracts/AraProxy.sol',
               './contracts/ignored_contracts/AraToken.sol']
const address = await registry.deployNewStandard({
  requesterDid,
  password,
  version,
  paths
})

Gets the content DIDs purchased by the requesterDID.

• requesterDid - The DID of the owner of the library

const lib = await library.getLibrary(did)

Gets the size of requesterDid's library.

• requesterDid - The DID of the owner of the library

const size = await library.getLibrarySize(did)

Gets the DID of the item at the provided index in requesterDid's library.

• opts
  • requesterDid - The DID of the owner of the library
  • index - The index of the content to retrieve

const contentDid = await library.getLibraryItem({ requesterDid, index: 1 })

• opts
  • contentDid - DID of the content to check the purchase of
  • purchaserDid - DID of purchaser
  • keyringOpts - optional Keyring options

const purchased = await library.hasPurchased({
  contentDid: 'did:ara:114045f3883a21735188bb02de024a4e1451cb96c5dcc80bdfa1b801ecf81b85',
  purchaserDid: 'did:ara:a51aa651c5a28a7c0a8de007843a00dcd24f3cc893522d3fb093c2bb7a323785'
})

Submits new DCDN job.

• opts
  • requesterDid - The DID of the person submitting the job
  • contentDid - The DID of the content this job is for
  • password - The password of the person submitting the job
  • job
    • jobId - The jobId of the job being submitted
    • budget - The budget to allocate for the job
  • gasPrice - Optional gas price in GWei
  • keyringOpts - Optional keyring options
  • onhash
  • onreceipt
  • onconfirmation
  • onerror
  • onmined

Returns transaction receipt object.

const jobId = '0x7dc039cfb220029c371d0f4aabf4a956ed0062d66c447df7b4595d7e11187271'
const budget = 10
const receipt = await rewards.submit({
  requesterDid,
  contentDid,
  password,
  job: {
    jobId,
    budget
  }
})

Allocates rewards amongst farmers for jobId.

• opts
  • requesterDid - The DID of the person who submitted the job
  • contentDid - The DID of the content the job is for
  • password - The password of the person who submitted the job
  • job
    • jobId - The jobId of the job to allocate for
    • farmers - The Ethereum addresses of the farmers to reward
    • rewards - The reward amounts in Ara tokens to split amongst farmers, respectively
  • gasPrice - Optional gas price in GWei
  • keyringOpts - Optional keyring options
  • onhash
  • onreceipt
  • onconfirmation
  • onerror
  • onmined

const jobId = '0x7dc039cfb220029c371d0f4aabf4a956ed0062d66c447df7b4595d7e11187271'
const farmers = ['0xF9403C6DA32DB4860F1eCB1c02B9A04D37c0e36e',
                 '0x70693d8f4e1c9bA1AE0870C35128BaDfDcF28FBc',
                 '0x19d6a7D8bB09e8A6d733a9c8D9fe7b964fD8F45e',
                 '0x629483C72b5191C1b522E887238a0A522b1D4F74']
const distribution = [10, 20, 30, 40]
await rewards.allocate({
  requesterDid,
  contentDid,
  password,
  job: {
    jobId,
    farmers,
    rewards: distribution
  }
})

Redeem Ara tokens (resulting from allocation return or from rewards) from AFS contract.

• opts
  • farmerDid - The DID of the person redeeming tokens
  • contentDid - The DID of the content to redeem from
  • password - The password of the person redeeming tokens
  • gasPrice - Optional gas price in GWei
  • keyringOpts - Optional keyring options
  • onhash
  • onreceipt
  • onconfirmation
  • onerror
  • onmined

Returns the number of Ara tokens redeemed.

const balance = await rewards.redeem({
  farmerDid,
  contentDid,
  password
})

Gets the budget for jobId.

• opts
  • contentDid - The DID of the content that has jobId
  • jobId - The jobId of the job to get the budget for

const budget = await rewards.getBudget({
  contentDid,
  jobId
})

Gets the address of the owner of a jobId.

• opts
  • contentDid - The DID of the content that has jobId
  • jobId - The jobId of the job to get the owner for

const owner = await rewards.getJobOwner({
  contentDid,
  jobId
})

Gets the balance (resulting from allocation return or from rewards) of farmerDid stored in contentDid.

• opts
  • farmerDid - The DID of the person to check the balance of
  • contentDid - The DID of the content where the balance is stored
  • password - The password of the person to check the balance of
  • keyringOpts - optional Keyring options

const balance = await rewards.getRewardsBalance({
  farmerDid,
  contentDid,
  password
})

Queries for the balance in Ara of an identity.

• did - The DID of the account to get the balance for
• keyringOpts - optional Keyring options

const did = 'did:ara:a51aa651c5a28a7c0a8de007843a00dcd24f3cc893522d3fb093c2bb7a323785'
const balance = await token.balanceOf(did) // 100.5

Gets the total circulating supply of Ara tokens.

const supply = await token.totalSupply() // 1000000000

Gets the amount in Ara that a spender is allowed to spend of an owner.

• owner - DID of the owner of the Ara tokens to be spent
• spender - DID of the account that will be spending owner's tokens

const owner = 'did:ara:a51aa651c5a28a7c0a8de007843a00dcd24f3cc893522d3fb093c2bb7a323785'
const spender = 'did:ara:114045f3883a21735188bb02de024a4e1451cb96c5dcc80bdfa1b801ecf81b85'
const allowance = await token.allowance({ owner, spender })

Transfers Ara from one account to another.

• opts
  • did - DID of the account that is sending the Ara
  • password - Password of the account sending Ara
  • to - DID of the account to receive the tokens
  • val - Amount to transfer
  • gasPrice - Optional gas price in GWei
  • keyringOpts - Optional keyring options
  • onhash
  • onreceipt
  • onconfirmation
  • onerror
  • onmined

Returns transaction receipt object.

const did = 'did:ara:a51aa651c5a28a7c0a8de007843a00dcd24f3cc893522d3fb093c2bb7a323785'
const password = 'password'
const recipient = 'did:ara:114045f3883a21735188bb02de024a4e1451cb96c5dcc80bdfa1b801ecf81b85'

const receipt = await token.transfer({
  did,
  password,
  to: recipient,
  val: '500'
})

Sets the approved token amount to be spent on an owner's behalf. This will overwrite any previous approvals.

• opts
  • did - DID of the account that owns the Ara
  • password - Password of the owning account
  • spender - DID of the account that will be spending the tokens
  • val - Amount to approve
  • gasPrice - Optional gas price in GWei
  • keyringOpts - Optional keyring options
  • onhash
  • onreceipt
  • onconfirmation
  • onerror
  • onmined

Returns transaction receipt object.

const did = 'did:ara:a51aa651c5a28a7c0a8de007843a00dcd24f3cc893522d3fb093c2bb7a323785'
const password = 'password'
const recipient = 'did:ara:114045f3883a21735188bb02de024a4e1451cb96c5dcc80bdfa1b801ecf81b85'

const receipt = await token.approve({
  did,
  password,
  spender,
  val: '500'
})

Transfers Ara from one address to another. This differs from transfer by requiring the tokens to be first approved to be spent.

• opts
  • from - The DID of the origin account of the Ara tokens to transfer (this account must approve did to perform the transfer beforehand)
  • to - DID of the account that will be receiving the tokens
  • val - Amount of Ara to transfer
  • did - DID of the account initiating the transfer on behalf of from
  • password - Password of the account initiating the transfer
  • gasPrice - Optional gas price in GWei
  • keyringOpts - Optional keyring options
  • onhash
  • onreceipt
  • onconfirmation
  • onerror
  • onmined

Returns transaction receipt object.

const origin = 'did:ara:08228219008e3c7ab8b7f23a161c196be44ff33525ebea01d841b707b34b7adc'
const recipient = 'did:ara:114045f3883a21735188bb02de024a4e1451cb96c5dcc80bdfa1b801ecf81b85'
const did = 'did:ara:a51aa651c5a28a7c0a8de007843a00dcd24f3cc893522d3fb093c2bb7a323785'
const password = 'password'

const receipt = await token.transferFrom({
  from: origin,
  to: recipient,
  val: '500',
  did,
  password,
})

Increases the approved amount that a spender can spend on behalf of an owner. This will not overwrite any existing approved amount, just increase it.

• opts
  • spender - DID of the spender
  • did - DID of the account that owns the Ara
  • password - Password of the owning account
  • val - Amount to increase the approval by
  • gasPrice - Optional gas price in GWei
  • keyringOpts - Optional keyring options
  • onhash
  • onreceipt
  • onconfirmation
  • onerror
  • onmined

Returns transaction receipt object.

const spender = 'did:ara:114045f3883a21735188bb02de024a4e1451cb96c5dcc80bdfa1b801ecf81b85'
const did = 'did:ara:a51aa651c5a28a7c0a8de007843a00dcd24f3cc893522d3fb093c2bb7a323785'
const password = 'password'

const receipt = await token.increaseApproval({
  spender,
  did,
  password,
  val: '10'
})

Decreases the approved amount that a spender can spend on behalf of an owner. This will not overwrite any existing approved amount, just decrease it.

• opts
  • spender - DID of the spender
  • did - DID of the account that owns the Ara
  • password - Password of the owning account
  • val - Amount to decrease the approval by
  • gasPrice - Optional gas price in GWei
  • keyringOpts - Optional keyring options
  • onhash
  • onreceipt
  • onconfirmation
  • onerror
  • onmined

Returns transaction receipt object.

const did = 'did:ara:a51aa651c5a28a7c0a8de007843a00dcd24f3cc893522d3fb093c2bb7a323785'
const password = 'password'
const spender = 'did:ara:114045f3883a21735188bb02de024a4e1451cb96c5dcc80bdfa1b801ecf81b85'

const receipt = await token.decreaseApproval({
  spender,
  did,
  password,
  val: '10'
})

Modifies the current amount deposited for rewards for a particular account.

• opts
  • did - DID of the account to update the deposit for
  • password - password of the account
  • val - value as string to deposit/withdraw
  • withdraw - boolean whether this should be a deposit or withdraw (defaults to false if not given)
  • gasPrice - Optional gas price in GWei
  • keyringOpts - Optional keyring options
  • onhash
  • onreceipt
  • onconfirmation
  • onerror
  • onmined

Returns transaction receipt object.

// deposits 50 Ara
const did = 'did:ara:a51aa651c5a28a7c0a8de007843a00dcd24f3cc893522d3fb093c2bb7a323785'
const password = 'password'

const receipt = await token.modifyDeposit({
  did,
  password,
  val: '50'
})

// withdraws 50 Ara from deposit
const did = 'did:ara:a51aa651c5a28a7c0a8de007843a00dcd24f3cc893522d3fb093c2bb7a323785'
const password = 'password'

const receipt = await token.modifyDeposit({
  did,
  password,
  val: '50',
  withdraw: true
})

Gets the current amount deposited by an account to be used for redeeming rewards.

• did - DID of the account to get the deposit balance for
• keyringOpts - optional Keyring options

const did = 'did:ara:a51aa651c5a28a7c0a8de007843a00dcd24f3cc893522d3fb093c2bb7a323785'
const amount = await token.getAmountDeposited(did) // '100'

Constrains token amount used in the EVM to its nominal value (Ara supports 18 decimals).

• val - The unconstrained token value as a String

const expandedValue = '1000000000000000000' // 1 Ara Token
const constrainedValue = token.constrainTokenValue(expandedValue) // constrainedValue === '1'

Expands nominal token value to its expanded form used in the EVM (Ara supports 18 decimals).

• val - The expanded token value as a String

const constrainedValue = '1'
const expandedValue = token.expandTokenValue(constrainedValue) // expandedValue === '1000000000000000000'

Approves an AFS ownership transfer request.

• opts
  • contentDid - The DID of the content to transfer ownership
  • password - The password of the current owner
  • afsPassword - The password of the AFS
  • newOwnerDid - The DID of the account to transfer ownership to
  • estimate - optional Flag to check cost of approveOwnershipTransfer
  • gasPrice - Optional gas price in GWei
  • keyringOpts - Optional keyring options
  • onhash
  • onreceipt
  • onconfirmation
  • onerror
  • onmined

Returns transaction receipt object.

const receipt = await ownership.approveOwnershipTransfer({
  contentDid,
  password,
  afsPassword,
  newOwnerDid
})

Revokes an outstanding ownership request of an AFS.

• opts
  • requesterDid - The DID of the account requesting ownership
  • contentDid - The DID of the content to transfer ownership
  • password - The password of the account requesting ownership
  • estimate - optional Flag to check cost of revokeOwnershipRequest
  • gasPrice - Optional gas price in GWei
  • keyringOpts - Optional keyring options
  • onhash
  • onreceipt
  • onconfirmation
  • onerror
  • onmined

Returns transaction receipt object.

const receipt = await ownership.revokeOwnershipRequest({
  requesterDid,
  contentDid,
  password
})

Requests ownership of an AFS.

• opts
  • requesterDid - The DID of the account requesting ownership
  • contentDid - The DID of the content to transfer ownership
  • password - The password of the account requesting ownership
  • estimate - optional Flag to check cost of requestOwnership
  • gasPrice - Optional gas price in GWei
  • keyringOpts - Optional keyring options
  • onhash
  • onreceipt
  • onconfirmation
  • onerror
  • onmined

Returns transaction receipt object.

const receipt = await ownership.requestOwnership({
  requesterDid,
  contentDid,
  password
})

Checks if a requester DID has requested ownership of an AFS.

• opts
  • requesterDid - The DID of the account requesting ownership
  • contentDid - The DID of the content in question
  • keyringOpts - optional Keyring options

Returns boolean.

const hasRequested = await ownership.hasRequested({ requesterDid, contentDid })

Gets the Ethereum address of the owner of an AFS.

• contentDid - The DID of the content to get the owner for

const owner = await ownership.getOwner(contentDid)

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Releases follow Semantic Versioning

• Truffle
• Ara Filesystem
• Ara Identity
• Stability index

LGPL-3.0