doc: add emissary introduction

.gitignore

@@ -9,4 +9,5 @@ dist/
 /agent-key.json
 /apps
 /server-key.json
-/.emissary-token
+/.emissary-token
+/out

doc/README.md

@@ -1,5 +1,7 @@
 # Documentation
 
+- (FR) - [Introduction](./fr/introduction.md)
+
 ## Tutorials
 
 - (FR) - [Premiers pas](./tutorials/fr/first-steps.md)

doc/fr/introduction.md

@@ -0,0 +1,19 @@
+# Introduction
+
+"Emissary" est un programme entrant dans la catégorie des outils de gestion et déploiement de configuration.
+
+En utilisant un agent déployé sur chaque système cible, il permet aux administrateurs système de centraliser le contrôle et la supervision de la configuration. Grâce à ses fonctionnalités avancées, il est capable de faire converger la configuration d'une machine vers un modèle précis défini par une ou plusieurs spécifications centralisées sur un serveur de pilotage dédié.
+
+Le principal atout d'"Emissary" réside dans sa capacité à activer des "contrôleurs" spécifiques pour chaque aspect de la configuration système. Ces contrôleurs sont des modules intelligents qui agissent comme des agents spécialisés, veillant à ce que les paramètres de configuration soient correctement appliqués et respectent les spécifications définies.
+
+Grâce à cette approche modulaire, "Emissary" peut gérer diverses facettes de la configuration, telles que les paramètres réseau, les règles de sécurité, les options de performance et bien plus encore. Chaque contrôleur est conçu pour répondre à des besoins spécifiques, offrant ainsi une flexibilité et une granularité optimales dans la gestion de la configuration.
+
+Certains contrôleurs permettent également l'exécution de services spécialisés comme des serveurs mandataires inverses ou des applications web autonomes.
+
+L'utilisation d'un serveur de pilotage centralisé permet à "Emissary" de stocker et de mettre à jour les spécifications de configuration de manière cohérente. Les administrateurs peuvent définir des modèles de configuration précis, les affiner au fil du temps et les appliquer en un seul clic sur l'ensemble du parc de machines gérées. Cela garantit une uniformité et une conformité accrues, tout en facilitant la maintenance et les mises à jour à grande échelle.
+
+À l'heure actuelle, Emissary est conçu pour cibler spécifiquement le système d'exploitation OpenWRT. L'activation des "contrôleurs" spécifiques à cet OS permet de converger la configuration de la machine OpenWRT vers un modèle correspondant aux spécifications centralisées sur le serveur de pilotage. Ces spécifications peuvent inclure des paramètres réseau, des configurations de sécurité, des règles de pare-feu, des options de routage, des services système, et bien d'autres éléments spécifiques à OpenWRT. 
+
+## Vue d'ensemble de l'architecture
+
+![](./resources/overview.svg)

doc/fr/resources/overview.plantuml

@@ -0,0 +1,55 @@
+@startuml
+top to bottom direction
+skinparam linetype ortho
+
+node PilotNode as "Pilot Node" {
+    database DataStore as "Data Store"
+
+    component EmissaryServer as "Emissary Server" {
+
+        component SpecificationRegistry as "Specification Registry" {
+            component UCISpecification as "UCI Spec"
+
+            component MDNSSpecification as "mDNS Spec"
+
+            component AppSpecification as "App Spec"
+
+            component ProxySpecification as "Proxy Spec"
+        }
+
+        component HTTPAPIHandler as "HTTP API Handler"
+
+        HTTPAPIHandler .down.> SpecificationRegistry: validates agents data with
+
+        HTTPAPIHandler .right.> DataStore: saves agent data in
+    }
+}
+
+node OpenWRTNode as "OpenWRT Node" {
+    component EmissaryAgent as "Emissary Agent" {
+
+        component StateManager as "State Manager"
+
+        StateManager --up-> HTTPAPIHandler: fetches specs from
+
+        component UCIController as "UCI Controller"
+
+        UCIController -up-> StateManager: reconciles with
+
+        component SysupgradeController as "Sysupgrade Controller"
+
+        SysupgradeController -up-> StateManager: reconciles with
+
+        component ProxyController as "Proxy Controller"
+
+        ProxyController -up-> StateManager: reconciles with
+
+        component MDNSController as "mDNS Controller"
+
+        MDNSController -up-> StateManager: reconciles with
+
+        component AppController as "App Controller"
+
+        AppController -up-> StateManager: reconciles with
+    }
+}

doc/fr/resources/overview.svg

@@ -0,0 +1,91 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" contentStyleType="text/css" height="619px" preserveAspectRatio="none" style="width:1572px;height:619px;background:#FFFFFF;" version="1.1" viewBox="0 0 1572 619" width="1572px" zoomAndPan="magnify"><defs/><g><!--MD5=[d09f24f3d7c03358bd8c02f81fe1cb3f]
+cluster PilotNode--><g id="cluster_PilotNode"><polygon fill="none" points="16,16,26,6,546,6,546,487,536,497,16,497,16,16" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.0;" x1="536" x2="546" y1="16" y2="6"/><line style="stroke:#181818;stroke-width:1.0;" x1="16" x2="536" y1="16" y2="16"/><line style="stroke:#181818;stroke-width:1.0;" x1="536" x2="536" y1="16" y2="497"/><text fill="#000000" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacing" textLength="73" x="240.5" y="33.9659">Pilot Node</text></g><!--MD5=[9c6b5fd9fe3a3a3c784efc27685ccdf9]
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+entity DataStore--><g id="elem_DataStore"><path d="M32,105.5 C32,95.5 77,95.5 77,95.5 C77,95.5 122,95.5 122,105.5 L122,133.5679 C122,143.5679 77,143.5679 77,143.5679 C77,143.5679 32,143.5679 32,133.5679 L32,105.5 " fill="#F1F1F1" style="stroke:#181818;stroke-width:0.5;"/><path d="M32,105.5 C32,115.5 77,115.5 77,115.5 C77,115.5 122,115.5 122,105.5 " fill="none" style="stroke:#181818;stroke-width:0.5;"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="70" x="42" y="134.4659">Data Store</text></g><!--MD5=[1d93137201a2ff7ad9fd687f5a9f986a]
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+entity MDNSSpecification--><g id="elem_MDNSSpecification"><rect fill="#F1F1F1" height="49.0679" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="118" x="348" y="214"/><rect fill="#F1F1F1" height="10" style="stroke:#181818;stroke-width:0.5;" width="15" x="446" y="219"/><rect fill="#F1F1F1" height="2" style="stroke:#181818;stroke-width:0.5;" width="4" x="444" y="221"/><rect fill="#F1F1F1" height="2" style="stroke:#181818;stroke-width:0.5;" width="4" x="444" y="225"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="78" x="363" y="248.9659">mDNS Spec</text></g><!--MD5=[f8753067470155b04e2f3a693924c320]
+entity AppSpecification--><g id="elem_AppSpecification"><rect fill="#F1F1F1" height="49.0679" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="103" x="213.5" y="368"/><rect fill="#F1F1F1" height="10" style="stroke:#181818;stroke-width:0.5;" width="15" x="296.5" y="373"/><rect fill="#F1F1F1" height="2" style="stroke:#181818;stroke-width:0.5;" width="4" x="294.5" y="375"/><rect fill="#F1F1F1" height="2" style="stroke:#181818;stroke-width:0.5;" width="4" x="294.5" y="379"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="63" x="228.5" y="402.9659">App Spec</text></g><!--MD5=[fd240f711946cd5d0dcadb1ea2ed786c]
+entity ProxySpecification--><g id="elem_ProxySpecification"><rect fill="#F1F1F1" height="49.0679" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="112" x="352" y="368"/><rect fill="#F1F1F1" height="10" style="stroke:#181818;stroke-width:0.5;" width="15" x="444" y="373"/><rect fill="#F1F1F1" height="2" style="stroke:#181818;stroke-width:0.5;" width="4" x="442" y="375"/><rect fill="#F1F1F1" height="2" style="stroke:#181818;stroke-width:0.5;" width="4" x="442" y="379"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="72" x="367" y="402.9659">Proxy Spec</text></g><!--MD5=[cbe48146c9698f81ea53c2c6f51c8eda]
+entity StateManager--><g id="elem_StateManager"><rect fill="#F1F1F1" height="49.0679" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="139" x="908.5" y="368"/><rect fill="#F1F1F1" height="10" style="stroke:#181818;stroke-width:0.5;" width="15" x="1027.5" y="373"/><rect fill="#F1F1F1" height="2" style="stroke:#181818;stroke-width:0.5;" width="4" x="1025.5" y="375"/><rect fill="#F1F1F1" height="2" style="stroke:#181818;stroke-width:0.5;" width="4" x="1025.5" y="379"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="99" x="923.5" y="402.9659">State Manager</text></g><!--MD5=[27f8877b35bcf78d2c9b0e363caea569]
+entity UCIController--><g id="elem_UCIController"><rect fill="#F1F1F1" height="49.0679" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="135" x="610.5" y="513"/><rect fill="#F1F1F1" height="10" style="stroke:#181818;stroke-width:0.5;" width="15" x="725.5" y="518"/><rect fill="#F1F1F1" height="2" style="stroke:#181818;stroke-width:0.5;" width="4" x="723.5" y="520"/><rect fill="#F1F1F1" height="2" style="stroke:#181818;stroke-width:0.5;" width="4" x="723.5" y="524"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="95" x="625.5" y="547.9659">UCI Controller</text></g><!--MD5=[c5e00a4ec481eea7d49d1c5ee6146b99]
+entity SysupgradeController--><g id="elem_SysupgradeController"><rect fill="#F1F1F1" height="49.0679" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="191" x="780.5" y="513"/><rect fill="#F1F1F1" height="10" style="stroke:#181818;stroke-width:0.5;" width="15" x="951.5" y="518"/><rect fill="#F1F1F1" height="2" style="stroke:#181818;stroke-width:0.5;" width="4" x="949.5" y="520"/><rect fill="#F1F1F1" height="2" style="stroke:#181818;stroke-width:0.5;" width="4" x="949.5" y="524"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="151" x="795.5" y="547.9659">Sysupgrade Controller</text></g><!--MD5=[ed1f476319cb2bbabd1b988180210f61]
+entity ProxyController--><g id="elem_ProxyController"><rect fill="#F1F1F1" height="49.0679" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="147" x="1006.5" y="513"/><rect fill="#F1F1F1" height="10" style="stroke:#181818;stroke-width:0.5;" width="15" x="1133.5" y="518"/><rect fill="#F1F1F1" height="2" style="stroke:#181818;stroke-width:0.5;" width="4" x="1131.5" y="520"/><rect fill="#F1F1F1" height="2" style="stroke:#181818;stroke-width:0.5;" width="4" x="1131.5" y="524"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="107" x="1021.5" y="547.9659">Proxy Controller</text></g><!--MD5=[dcaaaabc13b59746f8f74cc6285a228b]
+entity MDNSController--><g id="elem_MDNSController"><rect fill="#F1F1F1" height="49.0679" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="153" x="1188.5" y="513"/><rect fill="#F1F1F1" height="10" style="stroke:#181818;stroke-width:0.5;" width="15" x="1321.5" y="518"/><rect fill="#F1F1F1" height="2" style="stroke:#181818;stroke-width:0.5;" width="4" x="1319.5" y="520"/><rect fill="#F1F1F1" height="2" style="stroke:#181818;stroke-width:0.5;" width="4" x="1319.5" y="524"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="113" x="1203.5" y="547.9659">mDNS Controller</text></g><!--MD5=[f7cab0dbd7f354492deaa54be612571f]
+entity AppController--><g id="elem_AppController"><rect fill="#F1F1F1" height="49.0679" rx="2.5" ry="2.5" style="stroke:#181818;stroke-width:0.5;" width="138" x="1377" y="513"/><rect fill="#F1F1F1" height="10" style="stroke:#181818;stroke-width:0.5;" width="15" x="1495" y="518"/><rect fill="#F1F1F1" height="2" style="stroke:#181818;stroke-width:0.5;" width="4" x="1493" y="520"/><rect fill="#F1F1F1" height="2" style="stroke:#181818;stroke-width:0.5;" width="4" x="1493" y="524"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacing" textLength="98" x="1392" y="547.9659">App Controller</text></g><!--MD5=[fd3bb9f606ca36df494b1470d02cc152]
+link HTTPAPIHandler to SpecificationRegistry--><g id="link_HTTPAPIHandler_SpecificationRegistry"><path d="M178,144.45 C178,148.5388 178,152.9608 178,157.5818 C178,159.8924 178,162.2526 178,164.6459 C178,165.2442 178,165.8446 178,166.4468 C178,166.7479 178,167.0494 178,167.3513 C178,167.5023 178,167.6534 178,167.8046 " fill="none" id="HTTPAPIHandler-to-SpecificationRegistry" style="stroke:#181818;stroke-width:1.0;stroke-dasharray:7.0,7.0;"/><polygon fill="#181818" points="178,167.8046,182,158.8046,178,162.8046,174,158.8046,178,167.8046" style="stroke:#181818;stroke-width:1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="156" x="21" y="187.037">validates agents data with</text></g><!--MD5=[cb13386886cababd4d29cff1d3718e21]
+link HTTPAPIHandler to DataStore--><g id="link_HTTPAPIHandler_DataStore"><path d="M156.5,120 C156.5,120 128.14,120 128.14,120 " fill="none" id="HTTPAPIHandler-to-DataStore" style="stroke:#181818;stroke-width:1.0;stroke-dasharray:7.0,7.0;"/><polygon fill="#181818" points="123.14,120,132.14,124,128.14,120,132.14,116,123.14,120" style="stroke:#181818;stroke-width:1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="115" x="84.82" y="134.897">saves agent data in</text></g><!--MD5=[8b6ba0f53f60f0ead5186706490d7041]
+reverse link HTTPAPIHandler to StateManager--><g id="link_HTTPAPIHandler_StateManager"><path d="M321.41,120 C321.41,120 978,120 978,120 C978,120 978,300.76 978,367.84 " fill="none" id="HTTPAPIHandler-backto-StateManager" style="stroke:#181818;stroke-width:1.0;"/><polygon fill="#181818" points="316.41,120,325.41,124,321.41,120,325.41,116,316.41,120" style="stroke:#181818;stroke-width:1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="111" x="661.62" y="115.897">fetches specs from</text></g><!--MD5=[beea302d68a5d9dc6027ab4e0b987cea]
+reverse link StateManager to UCIController--><g id="link_StateManager_UCIController"><path d="M902.04,393 C902.04,393 678,393 678,393 C678,393 678,471.34 678,512.66 " fill="none" id="StateManager-backto-UCIController" style="stroke:#181818;stroke-width:1.0;"/><polygon fill="#181818" points="907.04,393,898.04,389,902.04,393,898.04,397,907.04,393" style="stroke:#181818;stroke-width:1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="88" x="641.19" y="388.897">reconciles with</text></g><!--MD5=[938f50f9fb145bcf63bbe138dd460340]
+reverse link StateManager to SysupgradeController--><g id="link_StateManager_SysupgradeController"><path d="M940,423.43 C940,423.43 940,512.9 940,512.9 " fill="none" id="StateManager-backto-SysupgradeController" style="stroke:#181818;stroke-width:1.0;"/><polygon fill="#181818" points="940,418.43,936,427.43,940,423.43,944,427.43,940,418.43" style="stroke:#181818;stroke-width:1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="88" x="851" y="464.057">reconciles with</text></g><!--MD5=[8dba0e44c0268b5c6a2c1c6565c41b8b]
+reverse link StateManager to ProxyController--><g id="link_StateManager_ProxyController"><path d="M1027,423.43 C1027,423.43 1027,512.9 1027,512.9 " fill="none" id="StateManager-backto-ProxyController" style="stroke:#181818;stroke-width:1.0;"/><polygon fill="#181818" points="1027,418.43,1023,427.43,1027,423.43,1031,427.43,1027,418.43" style="stroke:#181818;stroke-width:1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="88" x="938" y="483.057">reconciles with</text></g><!--MD5=[94df0ade1dc92be8853ce902c4f83dad]
+reverse link StateManager to MDNSController--><g id="link_StateManager_MDNSController"><path d="M1053.84,401 C1053.84,401 1265,401 1265,401 C1265,401 1265,473.45 1265,512.78 " fill="none" id="StateManager-backto-MDNSController" style="stroke:#181818;stroke-width:1.0;"/><polygon fill="#181818" points="1048.84,401,1057.84,405,1053.84,401,1057.84,397,1048.84,401" style="stroke:#181818;stroke-width:1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="88" x="1126.31" y="396.897">reconciles with</text></g><!--MD5=[e74434bc519cba41fdddc7c857699717]
+reverse link StateManager to AppController--><g id="link_StateManager_AppController"><path d="M1053.81,385 C1053.81,385 1446,385 1446,385 C1446,385 1446,469.45 1446,512.66 " fill="none" id="StateManager-backto-AppController" style="stroke:#181818;stroke-width:1.0;"/><polygon fill="#181818" points="1048.81,385,1057.81,389,1053.81,385,1057.81,381,1048.81,385" style="stroke:#181818;stroke-width:1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="88" x="1224.74" y="380.897">reconciles with</text></g><!--MD5=[34aa2b7ca241a8a2a8de801131c4d63d]
+@startuml
+top to bottom direction
+skinparam linetype ortho
+
+node PilotNode as "Pilot Node" {
+    database DataStore as "Data Store"
+
+    component EmissaryServer as "Emissary Server" {
+
+        component SpecificationRegistry as "Specification Registry" {
+            component UCISpecification as "UCI Spec"
+
+            component MDNSSpecification as "mDNS Spec"
+
+            component AppSpecification as "App Spec"
+
+            component ProxySpecification as "Proxy Spec"
+        }
+
+        component HTTPAPIHandler as "HTTP API Handler"
+
+        HTTPAPIHandler .down.> SpecificationRegistry: validates agents data with
+
+        HTTPAPIHandler .right.> DataStore: saves agent data in
+    }
+}
+
+node OpenWRTNode as "OpenWRT Node" {
+    component EmissaryAgent as "Emissary Agent" {
+
+        component StateManager as "State Manager"
+
+        StateManager - -up-> HTTPAPIHandler: fetches specs from
+
+        component UCIController as "UCI Controller"
+
+        UCIController -up-> StateManager: reconciles with
+
+        component SysupgradeController as "Sysupgrade Controller"
+
+        SysupgradeController -up-> StateManager: reconciles with
+
+        component ProxyController as "Proxy Controller"
+
+        ProxyController -up-> StateManager: reconciles with
+
+        component MDNSController as "mDNS Controller"
+
+        MDNSController -up-> StateManager: reconciles with
+
+        component AppController as "App Controller"
+
+        AppController -up-> StateManager: reconciles with
+    }
+}
+@end
+
+PlantUML version 1.2022.7(Mon Aug 22 19:01:30 CEST 2022)
+(GPL source distribution)
+Java Runtime: OpenJDK Runtime Environment
+JVM: OpenJDK 64-Bit Server VM
+Default Encoding: UTF-8
+Language: fr
+Country: FR
+--></g></svg>