feat: use on chain staking params for locked token APR multiplier (#62)

* add gitleaks pre-commit hook

* feat: use on chain staking params for locked token APR multiplier

---------

Co-authored-by: Vinod Tiwari <vinod.tiwari@piplabs.xyz>

Author: 0xHansLee

pkg/server/handler.go

@@ -470,6 +470,33 @@ func (s *Server) StakingValidatorsHandler() gin.HandlerFunc {
 			return
 		}
 
+		// Get staking params for locked token type multiplier
+		stakingParamsResp, err := GetStakingParams(s.conf.Blockchain.StoryAPIEndpoint)
+		if err != nil {
+			logger.Error().Err(err).Msg("failed to get staking params")
+			c.JSON(http.StatusOK, Response{
+				Code:  http.StatusInternalServerError,
+				Error: ErrInternalAPIServiceError.Error(),
+			})
+			return
+		}
+
+		var lockedTokenMultiplier decimal.Decimal
+		for _, tt := range stakingParamsResp.Msg.Params.TokenTypes {
+			if tt.TokenType == TokenTypeLocked {
+				lockedTokenMultiplier, err = decimal.NewFromString(tt.RewardsMultiplier)
+				if err != nil {
+					logger.Error().Err(err).Msg("failed to parse locked token type multiplier")
+					c.JSON(http.StatusOK, Response{
+						Code:  http.StatusInternalServerError,
+						Error: ErrInternalAPIServiceError.Error(),
+					})
+					return
+				}
+				break
+			}
+		}
+
 		// Query from API and database
 		stakingValidatorsResp, err := GetStakingValidators(s.conf.Blockchain.StoryAPIEndpoint, params)
 		if err != nil {
@@ -517,9 +544,9 @@ func (s *Server) StakingValidatorsHandler() gin.HandlerFunc {
 			}
 
 			valAPR := sysAPR.Mul(decimal.NewFromInt(1).Sub(commissionRate))
-			// Locked token type has 0.5x APR
+			// Apply locked token type multiplier from staking params
 			if val.SupportTokenType == 0 {
-				valAPR = valAPR.Div(decimal.NewFromInt(2))
+				valAPR = valAPR.Mul(lockedTokenMultiplier)
 			}
 
 			validators = append(validators, StakingValidatorData{
@@ -609,9 +636,33 @@ func (s *Server) StakingValidatorHandler() gin.HandlerFunc {
 		}
 
 		valAPR := sysAPR.Mul(decimal.NewFromInt(1).Sub(commissionRate))
-		// Locked token type has 0.5x APR
+		// Apply locked token type multiplier from staking params
 		if val.SupportTokenType == 0 {
-			valAPR = valAPR.Div(decimal.NewFromInt(2))
+			stakingParamsResp, err := GetStakingParams(s.conf.Blockchain.StoryAPIEndpoint)
+			if err != nil {
+				logger.Error().Err(err).Msg("failed to get staking params")
+				c.JSON(http.StatusOK, Response{
+					Code:  http.StatusInternalServerError,
+					Error: ErrInternalAPIServiceError.Error(),
+				})
+				return
+			}
+
+			for _, tt := range stakingParamsResp.Msg.Params.TokenTypes {
+				if tt.TokenType == TokenTypeLocked {
+					lockedTokenMultiplier, err := decimal.NewFromString(tt.RewardsMultiplier)
+					if err != nil {
+						logger.Error().Err(err).Msg("failed to parse locked token type multiplier")
+						c.JSON(http.StatusOK, Response{
+							Code:  http.StatusInternalServerError,
+							Error: ErrInternalAPIServiceError.Error(),
+						})
+						return
+					}
+					valAPR = valAPR.Mul(lockedTokenMultiplier)
+					break
+				}
+			}
 		}
 
 		msg := StakingValidatorData{