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This commit is contained in:
Matthias Kretschmann 2021-11-04 12:59:20 +01:00
parent 691bf70881
commit f505002fba
Signed by: m
GPG Key ID: 606EEEF3C479A91F
1 changed files with 49 additions and 53 deletions
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102
content/concepts/did-ddo.md
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@ -167,19 +167,15 @@ To produce `filesChecksum`:
```js
sha256(
algorithm_ddo.service['metadata'].attributes.encryptedFiles +
JSON.Stringify(algorithm_ddo.service['metadata'].attributes.main.files)
algorithm_ddo.metadata.encryptedFiles +
JSON.Stringify(algorithm_ddo.metadata.files)
)
```
To produce `containerSectionChecksum`:
```js
sha256(
JSON.Stringify(
algorithm_ddo.service['metadata'].attributes.main.algorithm.container
)
)
sha256(JSON.Stringify(algorithm_ddo.metadata.algorithm.container))
```
Example:
@ -224,50 +220,6 @@ Example:
}
```
## Credentials
By default, a consumer can access a resource if they have 1.0 datatokens. _Credentials_ allow the publisher to optionally specify finer-grained permissions.
Consider a medical data use case, where only a credentialed EU researcher can legally access a given dataset. Ocean supports this as follows: a consumer can only access the resource if they have 1.0 datatokens _and_ one of the specified `"allow"` credentials.
This is like going to an R-rated movie, where you can only get in if you show both your movie ticket (datatoken) _and_ some some id showing you're old enough (credential).
Only credentials that can be proven are supported. This includes Ethereum public addresses, and (in the future) [W3C Verifiable Credentials]() and more.
Ocean also supports `"deny"` credentials: if a consumer has any of these credentials, they cannot access the resource.
Here's an example object with both `"allow"` and `"deny"` entries:
```json
{
"credentials": {
"allow": [
{
"type": "address",
"values": ["0x123", "0x456"]
}
],
"deny": [
{
"type": "address",
"values": ["0x2222", "0x333"]
}
]
}
}
```
For future usage, we can extend that with different credentials types.
Example:
```json
{
"type": "credential3Box",
"values": ["profile1", "profile2"]
}
```
## Files
The `files` section contains a `file` object (that contains a list of `file` objects) and a `encryptedFiles` string which contains the encrypted urls
@ -305,9 +257,53 @@ Example:
}
```
## Credentials
By default, a consumer can access a resource if they have 1.0 datatokens. _Credentials_ allow the publisher to optionally specify finer-grained permissions.
Consider a medical data use case, where only a credentialed EU researcher can legally access a given dataset. Ocean supports this as follows: a consumer can only access the resource if they have 1.0 datatokens _and_ one of the specified `"allow"` credentials.
This is like going to an R-rated movie, where you can only get in if you show both your movie ticket (datatoken) _and_ some some id showing you're old enough (credential).
Only credentials that can be proven are supported. This includes Ethereum public addresses, and (in the future) [W3C Verifiable Credentials](https://www.w3.org/TR/vc-data-model/) and more.
Ocean also supports `"deny"` credentials: if a consumer has any of these credentials, they can not access the resource.
Here's an example object with both `"allow"` and `"deny"` entries:
```json
{
"credentials": {
"allow": [
{
"type": "address",
"values": ["0x123", "0x456"]
}
],
"deny": [
{
"type": "address",
"values": ["0x2222", "0x333"]
}
]
}
}
```
For future usage, we can extend that with different credentials types.
Example:
```json
{
"type": "credential3Box",
"values": ["profile1", "profile2"]
}
```
## DDO Hash
In order to ensure the integrity, a hash is computed for each DDO:
In order to ensure the integrity of the DDO, a hash is computed for each DDO:
```js
const hash = sha256(JSON.stringify(DDO))
@ -343,7 +339,7 @@ _Aquarius_ should always check the hash after data is decrypted via a _Provider_
## Aquarius Enhanced DDO Response
The following fields are added by Aquarius in its DDO response for convenience reasons. These are never stored on chain, and not taken into consideration when [hashing the DDO](#ddo-hash).
The following fields are added by Aquarius in its DDO response for convenience reasons. These are never stored on chain, and are not taken into consideration when [hashing the DDO](#ddo-hash).
### NFT