feat: add initial DID implementation

x/did/keeper/validate.go

@@ -1,7 +1,38 @@
 package keeper
 
-import sdk "github.com/cosmos/cosmos-sdk/types"
+import (
+	"time"
 
+	sdk "github.com/cosmos/cosmos-sdk/types"
+)
+
+// CheckValidatorExists checks if a validator exists
+func (k Keeper) CheckValidatorExists(ctx sdk.Context, addr string) bool {
+	address, err := sdk.ValAddressFromBech32(addr)
+	if err != nil {
+		return false
+	}
+	ok, err := k.StakingKeeper.Validator(ctx, address)
+	if err != nil {
+		return false
+	}
+	if ok != nil {
+		return true
+	}
+	return false
+}
+
+// GetAverageBlockTime returns the average block time in seconds
+func (k Keeper) GetAverageBlockTime(ctx sdk.Context) float64 {
+	return float64(ctx.BlockTime().Sub(ctx.BlockTime()).Seconds())
+}
+
+// GetExpirationBlockHeight returns the block height at which the given duration will have passed
+func (k Keeper) GetExpirationBlockHeight(ctx sdk.Context, duration time.Duration) int64 {
+	return ctx.BlockHeight() + int64(duration.Seconds()/k.GetAverageBlockTime(ctx))
+}
+
+// ValidServiceOrigin checks if a service origin is valid
 func (k Keeper) ValidServiceOrigin(ctx sdk.Context, origin string) bool {
 	rec, err := k.OrmDB.ServiceRecordTable().GetByOriginUri(ctx, origin)
 	if err != nil {
@@ -12,3 +43,28 @@ func (k Keeper) ValidServiceOrigin(ctx sdk.Context, origin string) bool {
 	}
 	return true
 }
+
+// VerifyMinimumStake checks if a validator has a minimum stake
+func (k Keeper) VerifyMinimumStake(ctx sdk.Context, addr string) bool {
+	address, err := sdk.AccAddressFromBech32(addr)
+	if err != nil {
+		return false
+	}
+	addval, err := sdk.ValAddressFromBech32(addr)
+	if err != nil {
+		return false
+	}
+	del, err := k.StakingKeeper.GetDelegation(ctx, address, addval)
+	if err != nil {
+		return false
+	}
+	if del.Shares.IsZero() {
+		return false
+	}
+	return del.Shares.IsPositive()
+}
+
+// VerifyServicePermissions checks if a service has permission
+func (k Keeper) VerifyServicePermissions(ctx sdk.Context, addr string, service string, permissions string) bool {
+	return false
+}