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+---
+KIP: "0027"
+Title: ReadOnly User guards
+Author: CryptoPascal
+Status: Draft
+Type: Standard
+Category: Pact
+Created: 2023/12/09
+---
+
+## Abstract
+
+The Proposal is to allow User guards to read User tables.
+
+
+## Motivation
+
+### Reminder: Purity in Pact.
+
+In Pact, it exists 3 levels of purity environment:
+  - **Impure** (normal)
+  - **ReadOnly**: Writing is not allowed, but Reading is allowed
+  - **SysOnly**: Writing / Reading is not allowed for User tables. Only Sys tables can be read.
+
+Currently (Pact 4.10), User guards called through `(enforce-guard)` must be **SysOnly** pure.
+
+### Rationales and new use cases
+
+Allowing User Guards to be **ReadOnly** pure may allow new use cases, making Pact much more powerful than it actually is.
+
+
+#### Namespace management by DAO / Complex Multi-sigs schemes
+
+Namespaces are managed by 2 guards (User & Admin).
+
+With a **ReadOnly** (instead of **SysOnly**) pure guards: complex namespaces management would be possible, like:
+
+- Deploy new modules/keyset depending on the number of votes.
+- Deploy new modules/keyset depending on the number of signatures.
+- Deploy new modules/keyset depending on a dynamically determined date.
+- Decentralized namespaces sales.
+- ....
+
+With the current behavior, the only (ugly) workaround is to use Modules guards.
+But Module guards are deprecated and will be soon removed.
+
+
+#### Smart wallets, and evolved accounts management.
+
+With a **ReadOnly** (instead of **SysOnly**) pure guards, new features will be available with straightforward implementations.
+This allows to create a variety of accounts in coin (or other fungible contracts, or poly-fungible):
+
+- Spending allowed by a number of votes
+- Spending allowed by a number of signatures
+- Spending allowed by given conditions (*eg:* locking money in another account)
+- Spending depending on context (*eg:* Allowed for buying an NFT of a given NFT)
+- ....
+
+Currently, it is still possible to find some workarounds by wrapping the account into a specific module.
+But this strongly limits the possibilities of interacting with non-cooperative third party contracts.
+
+### Possible drawbacks
+
+As stated by [#489](https://github.com/kadena-io/pact/issues/489), it exists at least 2 drawbacks:
+
+- It would allow user guards to recurse: [#380](https://github.com/kadena-io/pact/issues/380). But it seems that this has already been fixed:
+[#417](https://github.com/kadena-io/pact/pull/417) and [#913](https://github.com/kadena-io/pact/pull/913)
+
+- It would complexify FV analysis of user guards.
+
+
+## Specification
+
+
+|                              | Old Behavior  | New Behavior |
+|------------------------------| ------------- | -------------|
+| Read User table in U-Guard   | Failure       | OK           |
+| Write User table in U-guard  | Failure       | Failure      |
+
+
+
+
+
+## Examples
+
+Some basic examples:
+
+### A guard that checks that an account owns more than x KDAs
+
+```pact
+
+(module balance-checker GOV
+  (defcap GOV ()
+    (enforce fail "No-Upgrade"))
+
+  (defun has-minium-balance:bool (target-account:string min-balance:decimal)
+    (let ((bal (coin.get-balance target-account)))
+      (enforce (>= bal min-balance) "No"))
+  )
+
+  (defun get-guard:guard (target-account:string min-balance:decimal)
+    (create-user-guard (has-minimum-balance target-account min-balance))
+  )
+)
+
+(coin.create-account "alice" (balance-checker.get-guard "alice-savings" 1000.0))
+
+```
+Alice's main account will be unlocked only if the savings account has a balance of minimum 1000.0 KDA.
+
+This doesn't work currently (Pact 4.10) => `Failure: Illegal database access attempt (readRow)` but would be possible with this KIP implemented.
+
+
+### A guard that checks that N approvals have been given
+
+```pact
+
+(module ns-governance GOV
+  ...
+  ...
+  ...
+
+  (defconst MIN-APPROVALS 5)
+
+  (defun approve (ns:string)
+    (with-read approvals ns {'count:=cnt}
+      (insert approvals ns {'count: (+ cnt 1)}))
+  )
+
+  (defun enforce-approvals:bool (ns:string)
+    (with-read approvals ns {'count:=cnt}
+      (enforce (>= cnt MIN-APPROVALS) "min approvals condition not met"))
+  )
+
+  (defun not-allowed:bool ()
+    (enforce false "Not allowed")
+  )
+)
+
+(define-namespace 'my-namespace (create-user-guard (ns-governance.not-allowed))
+                                (create-user-guard (ns-governance.enforce-approvals 'my-namespace)))
+```
+
+The namespace can be rotated (and then modules added), when at least 5 people have given their approval.
+
+This doesn't work currently (Pact 4.10) => `Failure: Illegal database access attempt (readRow)` but would be possible with this KIP implemented.
+
+
+
+
+## Backwards Compatibility
+
+Changing the purity requirement of User Guards requires a Hard Fork.
+
+However, already defined User guards (ie: **SysOnly** pure), will still continue to work seamlessly after the hard fork.